Vulnerability-Lookup

GHSA-HJXH-HMM9-WCMC

Vulnerability from github – Published: 2026-05-11 18:31 – Updated: 2026-05-11 21:31

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.

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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": null
  },
  "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": "2026-05-11T21:31:32Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-2291 (GCVE-0-2026-2291)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:47 – Updated: 2026-05-13 12:45

Title

CVE-2026-2291

Summary

Severity ?

7.3 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

certcc

References

7 references

URL	Tags
https://www.suse.com/security/cve/CVE-2026-2291.html
https://www.kb.cert.org/vuls/id/471747
https://thekelleys.org.uk/dnsmasq/CVE/
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/pi-hole/FTL/releases/tag/v6.6.2

Impacted products

1 product

Vendor	Product	Version
dnsmasq	dnsmasq	Affected: 2.92rel2

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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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-2291",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T12:38:54.623336Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "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"
            }
          ]
        }
      ],
      "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"
      },
      "title": "CVE-2026-2291",
      "x_generator": {
        "engine": "VINCE 3.0.39",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-2291"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-2291",
    "datePublished": "2026-05-11T16:47:01.981Z",
    "dateReserved": "2026-02-10T15:41:17.169Z",
    "dateUpdated": "2026-05-13T12:45:01.944Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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.

Action not permitted

GHSA-HJXH-HMM9-WCMC

CVE-2026-2291 (GCVE-0-2026-2291)

Tags

Sightings

Nomenclature