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CVE-2026-5172

📛 CVE Title

CVE-2026-5172

⬇ Download JSON ⚠ View as Threat

Description

A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.

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-787: Out-of-bounds Write
Reserved
2026-03-30
Published
2026-05-11 18:48 UTC
Last updated
2026-05-13 14:48 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/5xxx/CVE-2026-5172.json
Linked Threat
CVE-2026-5172 — CVE-2026-5172

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 18:16:41 UTC
NVD last modified
2026-05-13 14:17:59 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
22.62% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 07:50 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-2026-29156
Assigner
certcc
Published
May 11, 2026, 4:48:46 PM
Updated
May 20, 2026, 2:10:25 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
0.0200
Vendors
dnsmasq
Products
dnsmasq (0 <2.92rel2)
dnsmasq (2.92rel2)
dnsmasq (2.93)

ENISA description: A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.

EUVD references (6)

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 (6)

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

MITRE references (6) 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 (6)

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 (16)

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

  • CVE-2026-5172 - Vulnerability Details - OpenCVE
    web:app.opencve.io

    Remediation No vendor fix or workaround currently provided. OpenCVE Recommended Actions Upgrade dnsmasq to the latest stable release once a patch addressing the heap read overflow is published. Configure network filtering or a DNS firewall to reject DNS responses that exceed the maximum allowed packet size or contain invalid record lengths.

    2026-05-23 21:01 UTC
  • Microsoft Patch Tuesday March 2026 - 78 Vulnerabilities Fixed ...
    web:cybersecuritynews.com

    Microsoft released its March 2026 Patch Tuesday security update on March 10, 2026 , addressing 78 vulnerabilities across Windows, Microsoft Office, Azure, SQL Server, and .NET. The update includes one actively exploited zero-day vulnerability and multiple Critical-rated flaws demanding immediate attention from security teams. The most urgent fix this month is CVE - 2026 -21262, the sole zero-day ...

    2026-05-23 21:01 UTC
  • Nvd - Cve-2026-5172
    web:nvd.nist.gov

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

    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
  • SecuriTricks - CVE-2026-5172
    web:securitricks.com

    CVE CVE-2026-5172 - Score : None - Source : cret@cert.org - Description : A buffer overflow in dnsmasq's extract_addresses () function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name () to advance the pointer past the record's end. - Tags : cret@cert.org, 2026 -05-11, CVE-2026-5172

    2026-05-23 21:01 UTC
  • February's Patch Tuesday release fixes 59 flaws ... - Computerworld
    web:www.computerworld.com

    Each month, the team at Readiness analyzes the latest Patch Tuesday updates from Microsoft and provides detailed, actionable testing guidance. The company's Patch Tuesday release for February ...

    2026-05-23 21:01 UTC
  • May 2026 Microsoft Patch Tuesday: Critical Security Updates, Secure ...
    web:www.dbtsupport.com

    The May 2026 Microsoft Patch Tuesday release includes security updates across supported Microsoft products and should be reviewed directly in the Microsoft Security Update Guide for the final CVE list, affected products, severity ratings, exploitability assessments, and any revised guidance.

    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
  • 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.

    2026-05-23 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
  • Microsoft and Adobe Patch Tuesday, April 2026 Security Update Review
    web:blog.qualys.com

    With Qualys Policy Audit's out-of-the-box mitigation or Compensatory Controls, which reduce the risk of a vulnerability being exploited because the remediation ( fix / patch ) cannot be done immediately, these security controls are not recommended by any industry standards, such as CIS and DISA-STIG.

    2026-05-26 02:50 UTC
  • Microsoft Issues Second Biggest Patch Tuesday Ever in April
    web:redmondmag.com

    Microsoft April 2026 Patch Tuesday fixed 163 CVEs , marking its second-largest security update. Three zero-day vulnerabilities impacted SharePoint, Chromium-based Edge workflows and Microsoft Defender.

    2026-05-26 02:50 UTC
  • Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
    web:www.bleepingcomputer.com

    Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.

    2026-05-26 02:50 UTC
  • Windows 11 KB5083769 April 2026 Patch Tuesday update is now ... - Neowin
    web:www.neowin.net

    Here's how it works. Windows 11 KB5083769 April 2026 Patch Tuesday update is now available to download The latest Windows 11 Patch Tuesday updates for April 2026 are now available.

    2026-05-26 02:50 UTC
  • Microsoft Issues Massive Windows Patch for 160+ Bugs ... - TechRepublic
    web:www.techrepublic.com

    Microsoft's April 2026 Patch Tuesday fixes 165 vulnerabilities, including two zero-days, in one of the company's largest monthly security updates.

    2026-05-26 02:50 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 02:50 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-5172.json.

{
  "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-5172",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T12:47:52.137124Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T12:48:16.998Z",
          "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": "A buffer overflow in dnsmasq\u2019s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record\u2019s end."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:57:28.843Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://www.kb.cert.org/vuls/id/471747"
        },
        {
          "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
        },
        {
          "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
        },
        {
          "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"
      },
      "title": "CVE-2026-5172",
      "x_generator": {
        "engine": "VINCE 3.0.39",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-5172"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-5172",
    "datePublished": "2026-05-11T16:48:46.219Z",
    "dateReserved": "2026-03-30T15:54:52.205Z",
    "dateUpdated": "2026-05-13T12:48:16.998Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}