{"api_version":"1","generated_at":"2026-07-24T19:44:26+00:00","cve":"CVE-2026-2291","urls":{"html":"https://cve.report/CVE-2026-2291","api":"https://cve.report/api/cve/CVE-2026-2291.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-2291","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-2291"},"summary":{"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.","state":"PUBLISHED","assigner":"certcc","published_at":"2026-05-11 18:16:31","updated_at":"2026-07-20 21:16:46"},"problem_types":["CWE-190: Integer Overflow or Wraparound"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"7.3","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","data":{"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"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"7.3","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"}}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2026/07/20/14","name":"http://www.openwall.com/lists/oss-security/2026/07/20/14","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/NixOS/nixpkgs/pull/519093","name":"https://github.com/NixOS/nixpkgs/pull/519093","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.suse.com/security/cve/CVE-2026-2291.html","name":"https://www.suse.com/security/cve/CVE-2026-2291.html","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.kb.cert.org/vuls/id/471747","name":"https://www.kb.cert.org/vuls/id/471747","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://thekelleys.org.uk/dnsmasq/CVE/","name":"https://thekelleys.org.uk/dnsmasq/CVE/","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/NixOS/nixpkgs/pull/519082","name":"https://github.com/NixOS/nixpkgs/pull/519082","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html","name":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/pi-hole/FTL/releases/tag/v6.6.2","name":"https://github.com/pi-hole/FTL/releases/tag/v6.6.2","refsource":"cret@cert.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://thekelleys.org.uk/dnsmasq/doc.html","name":"https://thekelleys.org.uk/dnsmasq/doc.html","refsource":"MITRE","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-2291","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-2291","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"dnsmasq","product":"dnsmasq","version":"affected 2.92rel2 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"2291","cve":"CVE-2026-2291","epss":"0.007540000","percentile":"0.510040000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:13"},"legacy_qids":[]},"source_records":{"cve_program":{"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"},{"providerMetadata":{"dateUpdated":"2026-07-20T20:30:02.766Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"url":"http://www.openwall.com/lists/oss-security/2026/07/20/14"}],"title":"CVE Program Container"}],"cna":{"affected":[{"product":"dnsmasq","vendor":"dnsmasq","versions":[{"lessThan":"2.92rel2","status":"affected","version":"0","versionType":"custom"}]}],"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":"2026-05-20T14:07:50.273Z","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 3.0.41","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":"2026-07-20T20:30:02.766Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-11 18:16:31","lastModifiedDate":"2026-07-20 21:16:46","problem_types":["CWE-190: Integer Overflow or Wraparound"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":3.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-13T12:38:54.623336Z","id":"CVE-2026-2291","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"2291","Ordinal":"1","Title":"CVE-2026-2291","CVE":"CVE-2026-2291","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"2291","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"CVE-2026-2291"}]}}}