CVE-2026-6276

Description

Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

Overview

State: PUBLISHED
Assigner (CNA): curl
CVSS severity: high
CVSS score: 7.5 / 10
CVSS vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score: 7.5 / 10 HIGH source: CNA overview
MSRC score: 7.5 / 10 HIGH MS rating: Moderate
CWE(s): CWE-346 Origin Validation Error
Reserved: 2026-04-14
Published: 2026-05-13 10:28 UTC
Last updated: 2026-05-13 19:26 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/6xxx/CVE-2026-6276.json
Linked Threat: CVE-2026-6276 — CVE-2026-6276

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-05-13 13:01:56 UTC
NVD last modified: 2026-05-14 14:21:06 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: nvd@nist.gov
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 3.6 / 10
EPSS score: 0.0001 (probability of exploitation in next 30 days)
EPSS percentile: 2.10% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD-assigned CWE(s): CWE-319 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-29928
Assigner: curl
Published: May 13, 2026, 8:28:19 AM
Updated: May 13, 2026, 5:26:06 PM
EUVD base score (CVSS 3.1): 7.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EUVD-reported EPSS: 0.0100
Vendors: curl
Products: curl (8.14.0 ≤8.14.0)

curl (8.4.0 ≤8.4.0)

curl (8.1.1 ≤8.1.1)

curl (7.83.1 ≤7.83.1)

curl (8.11.1 ≤8.11.1)

curl (8.11.0 ≤8.11.0)

curl (7.71.1 ≤7.71.1)

curl (8.2.0 ≤8.2.0)

curl (7.83.0 ≤7.83.0)

curl (8.9.0 ≤8.9.0)

curl (7.86.0 ≤7.86.0)

curl (7.87.0 ≤7.87.0)

curl (7.72.0 ≤7.72.0)

curl (7.80.0 ≤7.80.0)

curl (8.13.0 ≤8.13.0)

curl (7.88.0 ≤7.88.0)

curl (8.6.0 ≤8.6.0)

curl (7.79.0 ≤7.79.0)

curl (7.79.1 ≤7.79.1)

curl (8.7.1 ≤8.7.1)

curl (8.14.1 ≤8.14.1)

curl (8.10.0 ≤8.10.0)

curl (8.10.1 ≤8.10.1)

curl (7.82.0 ≤7.82.0)

curl (7.77.0 ≤7.77.0)

curl (8.17.0 ≤8.17.0)

curl (7.76.1 ≤7.76.1)

curl (8.5.0 ≤8.5.0)

curl (8.0.1 ≤8.0.1)

curl (7.74.0 ≤7.74.0)

curl (8.12.1 ≤8.12.1)

curl (8.1.2 ≤8.1.2)

curl (8.1.0 ≤8.1.0)

curl (7.71.0 ≤7.71.0)

curl (7.81.0 ≤7.81.0)

curl (8.0.0 ≤8.0.0)

curl (7.73.0 ≤7.73.0)

curl (8.16.0 ≤8.16.0)

curl (8.15.0 ≤8.15.0)

curl (8.18.0 ≤8.18.0)

curl (7.88.1 ≤7.88.1)

curl (7.75.0 ≤7.75.0)

curl (8.7.0 ≤8.7.0)

curl (8.12.0 ≤8.12.0)

curl (8.9.1 ≤8.9.1)

curl (8.2.1 ≤8.2.1)

curl (8.8.0 ≤8.8.0)

curl (8.3.0 ≤8.3.0)

curl (7.78.0 ≤7.78.0)

curl (7.84.0 ≤7.84.0)

curl (7.76.0 ≤7.76.0)

curl (7.85.0 ≤7.85.0)

curl (8.19.0 ≤8.19.0)

ENISA description: Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

EUVD references (3)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-07-28 03:00 UTC (source: CVRF).

MS severity: Moderate
MS CVSS base score: 7.5 / 10 (temporal 6.9)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U
Release: 2026-May

Microsoft remediations / KB articles (2)

CBL-Mariner Releases — Vendor Fix / Security Update (fixed build 8.11.1-7)
https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade — None Available / CBL-Mariner Releases

Affected products (1)

Vendor	Product	Versions	Platforms
curl	curl	`8.19.0` (affected), `8.18.0` (affected), `8.17.0` (affected), `8.16.0` (affected), `8.15.0` (affected), `8.14.1` (affected), `8.14.0` (affected), `8.13.0` (affected), `8.12.1` (affected), `8.12.0` (affected), `8.11.1` (affected), `8.11.0` (affected), `8.10.1` (affected), `8.10.0` (affected), `8.9.1` (affected), `8.9.0` (affected), `8.8.0` (affected), `8.7.1` (affected), `8.7.0` (affected), `8.6.0` (affected), `8.5.0` (affected), `8.4.0` (affected), `8.3.0` (affected), `8.2.1` (affected), `8.2.0` (affected), `8.1.2` (affected), `8.1.1` (affected), `8.1.0` (affected), `8.0.1` (affected), `8.0.0` (affected), `7.88.1` (affected), `7.88.0` (affected), `7.87.0` (affected), `7.86.0` (affected), `7.85.0` (affected), `7.84.0` (affected), `7.83.1` (affected), `7.83.0` (affected), `7.82.0` (affected), `7.81.0` (affected), `7.80.0` (affected), `7.79.1` (affected), `7.79.0` (affected), `7.78.0` (affected), `7.77.0` (affected), `7.76.1` (affected), `7.76.0` (affected), `7.75.0` (affected), `7.74.0` (affected), `7.73.0` (affected), `7.72.0` (affected), `7.71.1` (affected), `7.71.0` (affected)	—

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

MITRE references (3) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (8)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

None Available msrc
MSRC update guide: CVE-2026-6276 msrc
https://attackerkb.com/topics/CVE-2026-6276 rapid7:attackerkb.com
https://ubuntu.com/security/notices/USN-8227-1 rapid7:ubuntu.com
http://www.openwall.com/lists/oss-security/2026/04/29/13 tenable:www.openwall.com
https://nvd.nist.gov/vuln/detail/CVE-2026-6276 tenable:nvd.nist.gov
https://www.cve.org/CVERecord?id=CVE-2026-6276 tenable:www.cve.org
https://www.first.org/epss/ tenable:www.first.org

NVD-tagged references (5)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

http://www.openwall.com/lists/oss-security/2026/04/29/13 af854a3a-2127-422b-91ae-364da2661108 Mailing ListThird Party Advisory
https://curl.se/docs/CVE-2026-6276.html 2499f714-1537-4658-8207-48ae4bb9eae9 PatchVendor Advisory
https://curl.se/docs/CVE-2026-6276.json 2499f714-1537-4658-8207-48ae4bb9eae9 Product
https://hackerone.com/reports/3671818 2499f714-1537-4658-8207-48ae4bb9eae9 ExploitIssue TrackingThird Party Advisory
https://hackerone.com/reports/3671818 134c704f-9b21-4f2e-91b3-4a467353bcc0 ExploitIssue TrackingThird Party Advisory

Remediations (15)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Patch Tuesday, May 2026 Edition - Krebs on Security

web:krebsonsecurity.com

Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

2026-05-23 20:55 UTC
Nvd - Cve-2026-27876

web:nvd.nist.gov

An official website of the United States government Here's how you know

2026-05-23 20:55 UTC
Addressing Exchange Server May 2026 vulnerability CVE-2026-42897

web:techcommunity.microsoft.com

We wanted to tell you how to address the Exchange Server May 2026 vulnerability CVE - 2026 -42897.

2026-05-23 20:55 UTC
April 2026 ArcGIS Security Bulletin - Esri

web:www.esri.com

Key highlights Portal for ArcGIS Security 2026 Update 1 Patch Portal for ArcGIS 11.4, 11.5, and 12.0 require a security patch US CISA recommends applying Critical Security patches within 15 days Patch /update resets potentially over-scoped developer credentials Check if your applications/scripts using developer credentials are fully operational after update

2026-05-23 20:55 UTC
Microsoft May 2026 Patch Tuesday: Many fixes, but no zero-days

web:www.helpnetsecurity.com

Microsoft has marked May 2026 Patch Tuesday by releasing fixes for 120+ CVE -numbered vulnerabilities, none of which are actively exploited.

2026-05-23 20:55 UTC
Oracle Critical Patch Update (CPU) for 2026 Fixes 337 ... - LinkedIn

web:www.linkedin.com

Oracle has released its January 2026 Critical Patch Update (CPU), a wide-ranging security bulletin that addresses 337 newly identified vulnerabilities across a broad spectrum of its enterprise ...

2026-05-23 20:55 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-23 20:55 UTC
CVE 2026 — The Vulnerabilities That Matter Most Right Now

web:www.penligent.ai

Second, chipset and OEM dependencies make remediation slower and messier than software-only patching. Google's bulletin explains the two Android patch levels for March 2026 and clarifies that devices with security patch levels of 2026 -03-01 or 2026 -03-05 are protected against the associated issues, depending on applicable components.

2026-05-23 20:55 UTC
Windows 11 April 2026 Update tested: What's new, improved and fixed

web:www.windowslatest.com

Windows 11 April 2026 update adds Narrator Copilot support, faster Settings, File Explorer fixes, and key security improvements.

2026-05-23 20:55 UTC
Patch Tuesday May 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's May 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-05-23 20:55 UTC
Oracle Critical Patch Update, April 2026 Security Update Review

web:blog.qualys.com

Oracle released its second quarterly edition of this year's Critical Patch Update. The update received patches for 481 security vulnerabilities.

2026-05-26 02:54 UTC
Patch Tuesday, April 2026 Edition - Krebs on Security

web:krebsonsecurity.com

For a clickable, per- patch breakdown, check out the SANS Internet Storm Center Patch Tuesday roundup. Running into problems applying any of these updates?

2026-05-26 02:54 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-05-26 02:54 UTC
Critical Patches Issued for Microsoft Products, April 14, 2026

web:www.cisecurity.org

<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...

2026-05-26 02:54 UTC
Quantifying 2026 Routinely Targeted Vulnerabilities (So Far)

web:www.vulncheck.com

In February, VulnCheck introduced our 2025 Routinely Targeted Vulnerabilities list, a compilation of CVEs researched and exploited by a range of threat actors in 2025. Today, we're releasing a list of 2026 vulnerabilities that our analysts have determined qualify for "Routinely Targeted" status based on a combination of threat actor, ransomware, and botnet targeting, along with public ...

2026-05-26 02:54 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-6276.json.

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-05-13T09:05:37.539Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/04/29/13"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-6276",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T17:24:29.094167Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T17:26:06.894Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://hackerone.com/reports/3671818"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThanOrEqual": "8.19.0",
              "status": "affected",
              "version": "8.19.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.18.0",
              "status": "affected",
              "version": "8.18.0",
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            },
            {
              "lessThanOrEqual": "8.17.0",
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            },
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            {
              "lessThanOrEqual": "8.14.1",
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              "lessThanOrEqual": "8.14.0",
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            {
              "lessThanOrEqual": "8.13.0",
              "status": "affected",
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            {
              "lessThanOrEqual": "8.12.1",
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            {
              "lessThanOrEqual": "8.12.0",
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            },
            {
              "lessThanOrEqual": "8.11.1",
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            {
              "lessThanOrEqual": "8.11.0",
              "status": "affected",
              "version": "8.11.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.10.1",
              "status": "affected",
              "version": "8.10.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.10.0",
              "status": "affected",
              "version": "8.10.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.9.1",
              "status": "affected",
              "version": "8.9.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.9.0",
              "status": "affected",
              "version": "8.9.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.8.0",
              "status": "affected",
              "version": "8.8.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.7.1",
              "status": "affected",
              "version": "8.7.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.7.0",
              "status": "affected",
              "version": "8.7.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.6.0",
              "status": "affected",
              "version": "8.6.0",
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            },
            {
              "lessThanOrEqual": "8.5.0",
              "status": "affected",
              "version": "8.5.0",
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            },
            {
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              "status": "affected",
              "version": "8.4.0",
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            },
            {
              "lessThanOrEqual": "8.3.0",
              "status": "affected",
              "version": "8.3.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.2.1",
              "status": "affected",
              "version": "8.2.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.2.0",
              "status": "affected",
              "version": "8.2.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.1.2",
              "status": "affected",
              "version": "8.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.1.1",
              "status": "affected",
              "version": "8.1.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.1.0",
              "status": "affected",
              "version": "8.1.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.0.1",
              "status": "affected",
              "version": "8.0.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.0.0",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.88.1",
              "status": "affected",
              "version": "7.88.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.88.0",
              "status": "affected",
              "version": "7.88.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.87.0",
              "status": "affected",
              "version": "7.87.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.86.0",
              "status": "affected",
              "version": "7.86.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.85.0",
              "status": "affected",
              "version": "7.85.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.84.0",
              "status": "affected",
              "version": "7.84.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.83.1",
              "status": "affected",
              "version": "7.83.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.83.0",
              "status": "affected",
              "version": "7.83.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.82.0",
              "status": "affected",
              "version": "7.82.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.81.0",
              "status": "affected",
              "version": "7.81.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.80.0",
              "status": "affected",
              "version": "7.80.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.79.1",
              "status": "affected",
              "version": "7.79.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.79.0",
              "status": "affected",
              "version": "7.79.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.78.0",
              "status": "affected",
              "version": "7.78.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.77.0",
              "status": "affected",
              "version": "7.77.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.76.1",
              "status": "affected",
              "version": "7.76.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.76.0",
              "status": "affected",
              "version": "7.76.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.75.0",
              "status": "affected",
              "version": "7.75.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.74.0",
              "status": "affected",
              "version": "7.74.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.73.0",
              "status": "affected",
              "version": "7.73.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.72.0",
              "status": "affected",
              "version": "7.72.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.71.1",
              "status": "affected",
              "version": "7.71.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.71.0",
              "status": "affected",
              "version": "7.71.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Muhamad Arga Reksapati"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Daniel Stenberg"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Using libcurl, when a custom `Host:` header is first set for an HTTP request\nand a second request is subsequently done using the same *easy handle* but\nwithout the custom `Host:` header set, the second request would use stale\ninformation and pass on cookies meant for the first host in the second\nrequest. Leak them."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-346 Origin Validation Error",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T08:28:19.273Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-6276.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-6276.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3671818"
        }
      ],
      "title": "stale custom cookie host causes cookie leak"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-6276",
    "datePublished": "2026-05-13T08:28:19.273Z",
    "dateReserved": "2026-04-14T14:01:54.772Z",
    "dateUpdated": "2026-05-13T17:26:06.894Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}