{"id":"CVE-2026-2291","state":"PUBLISHED","title":"CVE-2026-2291","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.","publishedAt":"2026-05-11T16:47:01.981Z","updatedAt":"2026-07-20T20:30:02.766Z","severity":{"score":7.3,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","source":"CISA-ADP"},"assigner":"certcc","products":["dnsmasq dnsmasq"],"affected":[{"vendor":"dnsmasq","product":"dnsmasq","versions":[{"version":"0","status":"affected","lessThan":"2.92rel2","versionType":"custom"}]}],"references":["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-discuss/2026q2/018471.html","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","http://www.openwall.com/lists/oss-security/2026/07/20/14"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/2xxx/CVE-2026-2291.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-2291","state":"PUBLISHED","datePublished":"2026-05-11T16:47:01.981Z","dateUpdated":"2026-07-20T20:30:02.766Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2026-02-10T15:41:17.169Z"},"containers":{"cna":{"title":"CVE-2026-2291","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."}],"affected":[{"vendor":"dnsmasq","product":"dnsmasq","versions":[{"version":"0","status":"affected","lessThan":"2.92rel2","versionType":"custom"}]}],"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"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-190: Integer Overflow or Wraparound"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-05-20T14:07:50.273Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.41","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-2291"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.3,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T12:38:54.623336Z","id":"CVE-2026-2291","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T12:45:01.944Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/07/20/14"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-20T20:30:02.766Z"}}]}}}