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CVE-2026-2291

📛 CVE Title

CVE-2026-2291

⬇ Download JSON ⚠ View as Threat

Description

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

Overview

State
PUBLISHED
Assigner (CNA)
certcc
CVSS severity
high
CVSS score
CVSS 7.3 / 10 7.3 7.3 / 10
CVSS vector
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Effective score
7.3 / 10 HIGH source: CNA overview
MSRC score
7.3 / 10 HIGH MS rating: Moderate
CWE(s)
CWE-190: Integer Overflow or Wraparound
Reserved
2026-02-10
Published
2026-05-11 18:47 UTC
Last updated
2026-05-13 14:45 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/2xxx/CVE-2026-2291.json
Linked Threat
CVE-2026-2291 — CVE-2026-2291

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
2026-05-11 18:16:31 UTC
NVD last modified
2026-05-13 14:17:14 UTC
NVD CVSS v3.1
CVSS 7.3 / 10 7.3 7.3 / 10 HIGH source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Exploitability subscore
3.9 / 10
Impact subscore
3.4 / 10
EPSS score
0.0008 (probability of exploitation in next 30 days)
EPSS percentile
22.59% vs all CVEs — higher = more likely to be exploited, as of 2026-05-25

NVD / KEV / EPSS data refreshed 2026-05-25 17:07 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

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-2026-29091
Assigner
certcc
Published
May 11, 2026, 4:47:01 PM
Updated
May 20, 2026, 2:07:50 PM
EUVD base score (CVSS 3.1)
7.3 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EUVD-reported EPSS
0.0800
Vendors
dnsmasq
Products
dnsmasq (0 <2.92rel2)
dnsmasq (2.92rel2)
dnsmasq (2.93)

ENISA description: dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

EUVD references (7)

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
7.3 / 10 (temporal 6.7)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U
Release
2026-May
Microsoft remediations / KB articles (2)

Affected products (1)
VendorProductVersionsPlatforms
dnsmasq dnsmasq 2.92rel2 (affected) —

Vendor references (7)

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

MITRE references (7) cveawg.mitre.org

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

Web references (9)

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

NVD-tagged references (7)

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

Remediations (18)

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

  • April 2026 Critical Patch Update Released | security - Oracle Blogs
    web:blogs.oracle.com

    For more information about the Critical Patch Update program, see the security vulnerability remediation practices page located on the Oracle Trust Center.

    2026-05-23 21:01 UTC
  • CISA Warns of Exploited Microsoft Defender 0-Day Flaws
    web:cyberpress.org

    The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added two actively exploited Microsoft Defender vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog, issuing an urgent remediation directive for federal agencies with a due date of June 3, 2026 .

    2026-05-23 21:01 UTC
  • Microsoft addresses 137 vulnerabilities in May's Patch Tuesday ...
    web:cyberscoop.com

    Threats Microsoft addresses 137 vulnerabilities in May's Patch Tuesday, including 13 rated critical The high volume of vulnerabilities reflects a growing trend researchers have been anticipating as artificial intelligence models are deployed to find previously uncovered defects in code.

    2026-05-23 21:01 UTC
  • 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 21:01 UTC
  • Security Update Guide - Microsoft Security Response Center
    web:msrc.microsoft.com

    Security Update Guide - Microsoft Security Response Center

    2026-05-23 21:01 UTC
  • Security Update Guide - Microsoft
    web:portal.msrc.microsoft.com

    The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

    2026-05-23 21:01 UTC
  • Microsoft May 2026 Patch Tuesday fixes 120 flaws, no zero-days
    web:www.bleepingcomputer.com

    Today is Microsoft's May 2026 Patch Tuesday, with security updates for 120 flaws and no zero-days disclosed this month.

    2026-05-23 21:01 UTC
  • 2 New Microsoft Defender Zero-Days Exploited—Patch Now ... - Forbes
    web:www.forbes.com

    Microsoft has confirmed an emergency security update as CISA warns that two new Defender zero-days are being exploited by attackers.

    2026-05-23 21:01 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 21:01 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 21:01 UTC
  • CVE-2026-2291 - Vulnerability Details - OpenCVE
    web:app.opencve.io

    Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Update dnsmasq to the latest released version that contains the fix , following vendor advisories Restrict inbound DNS traffic to trusted network segments or specific IP addresses using firewall rules, limiting which hosts can query the server

    2026-05-26 02:49 UTC
  • dnsmasqs extract_name () function can be abused to cause a...
    web:github.com

    GitHub is where people build software. More than 150 million people use GitHub to discover, fork, and contribute to over 420 million projects.

    2026-05-26 02:49 UTC
  • Security Advisories and Bulletins | Microsoft Learn
    web:learn.microsoft.com

    Learning path Learn how Microsoft supports secure software development as part of a cybersecurity solution - Training Secure software development means integrating security into each phase of your development lifecycle, from requirements analysis to maintenance. Microsoft provides many services that can help you develop more secure code and deploy a more secure application in the cloud. This ...

    2026-05-26 02:49 UTC
  • Microsoft's May 2026 Patch Tuesday Fixes 130+ Vulnerabilities ...
    web:windowsreport.com

    Microsoft has released its May 2026 Patch Tuesday updates for Windows 11 and Windows 10, shipping as KB5089549 and KB5087544. The updates include fixes for more than 130 security vulnerabilities across Windows, Office, SharePoint, DNS components, and core system services, as Bleeping Computer writes. While no publicly disclosed zero-day vulnerabilities were reported this month, the […]

    2026-05-26 02:49 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 02:49 UTC
  • Emergency patch issued for Microsoft Office, 365 over hacking threat - MSN
    web:www.msn.com

    Original story: Microsoft has released an emergency patch for a vulnerability in the company's Office programs that's already being exploited by hackers.

    2026-05-26 02:49 UTC
  • Microsoft fixes 167 security flaws in April, second biggest Patch ...
    web:www.pcworld.com

    This month's Patch Tuesday includes an actively exploited Office zero-day vulnerability and several critical RCE bugs in Windows and Remote Desktop.

    2026-05-26 02:49 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.

    2026-05-26 02:49 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-2291.json.

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "LOW",
              "baseScore": 7.3,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
              "version": "3.1"
            }
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                "options": [
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                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T12:38:54.623336Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        "providerMetadata": {
          "dateUpdated": "2026-05-13T12:45:01.944Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "dnsmasq",
          "vendor": "dnsmasq",
          "versions": [
            {
              "status": "affected",
              "version": "2.92rel2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-190: Integer Overflow or Wraparound",
              "lang": "en"
            }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:59:05.194Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://www.suse.com/security/cve/CVE-2026-2291.html"
        },
        {
          "url": "https://www.kb.cert.org/vuls/id/471747"
        },
        {
          "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
        },
        {
          "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
        },
        {
          "url": "https://github.com/NixOS/nixpkgs/pull/519082"
        },
        {
          "url": "https://github.com/NixOS/nixpkgs/pull/519093"
        },
        {
          "url": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
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    "assignerShortName": "certcc",
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    "dateReserved": "2026-02-10T15:41:17.169Z",
    "dateUpdated": "2026-05-13T12:45:01.944Z",
    "state": "PUBLISHED"
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