FKIE_CVE-2026-5172

Vulnerability from fkie_nvd - Published: 2026-05-11 18:16 - Updated: 2026-05-13 14:17
Severity ?
7.3 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Summary
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.
References
cret@cert.orghttps://github.com/NixOS/nixpkgs/pull/519082
cret@cert.orghttps://github.com/NixOS/nixpkgs/pull/519093
cret@cert.orghttps://github.com/pi-hole/FTL/releases/tag/v6.6.2
cret@cert.orghttps://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
cret@cert.orghttps://thekelleys.org.uk/dnsmasq/CVE/
cret@cert.orghttps://www.kb.cert.org/vuls/id/471747
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-5172",
  "lastModified": "2026-05-13T14:17:59.083",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-05-11T18:16:41.920",
  "references": [
    {
      "source": "cret@cert.org",
      "url": "https://github.com/NixOS/nixpkgs/pull/519082"
    },
    {
      "source": "cret@cert.org",
      "url": "https://github.com/NixOS/nixpkgs/pull/519093"
    },
    {
      "source": "cret@cert.org",
      "url": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2"
    },
    {
      "source": "cret@cert.org",
      "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
    },
    {
      "source": "cret@cert.org",
      "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
    },
    {
      "source": "cret@cert.org",
      "url": "https://www.kb.cert.org/vuls/id/471747"
    }
  ],
  "sourceIdentifier": "cret@cert.org",
  "vulnStatus": "Awaiting Analysis"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.