GHSA-HJXH-HMM9-WCMC

Vulnerability from github – Published: 2026-05-11 18:31 – Updated: 2026-07-20 21:31
VLAI
Details

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.

Severity
7.3 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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{
  "affected": [],
  "aliases": [
    "CVE-2026-2291"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-11T18:16:31Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-hjxh-hmm9-wcmc",
  "modified": "2026-07-20T21:31:40Z",
  "published": "2026-05-11T18:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-2291"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NixOS/nixpkgs/pull/519082"
    },
    {
      "type": "WEB",
      "url": "https://github.com/NixOS/nixpkgs/pull/519093"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2"
    },
    {
      "type": "WEB",
      "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
    },
    {
      "type": "WEB",
      "url": "https://thekelleys.org.uk/dnsmasq/CVE"
    },
    {
      "type": "WEB",
      "url": "https://thekelleys.org.uk/dnsmasq/doc.html"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/471747"
    },
    {
      "type": "WEB",
      "url": "https://www.suse.com/security/cve/CVE-2026-2291.html"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/20/14"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ]
}



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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.
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  • 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.