{"id":"CVE-2026-4893","state":"PUBLISHED","title":"CVE-2026-4893","description":"An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.","publishedAt":"2026-05-11T16:48:15.106Z","updatedAt":"2026-05-20T14:09:53.804Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","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.kb.cert.org/vuls/id/471747","https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html","https://thekelleys.org.uk/dnsmasq/CVE/","https://github.com/NixOS/nixpkgs/pull/519093","https://github.com/NixOS/nixpkgs/pull/519082","https://github.com/pi-hole/FTL/releases/tag/v6.6.2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/4xxx/CVE-2026-4893.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4893","state":"PUBLISHED","datePublished":"2026-05-11T16:48:15.106Z","dateUpdated":"2026-05-20T14:09:53.804Z","assignerShortName":"certcc","assignerOrgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateReserved":"2026-03-26T13:12:03.722Z"},"containers":{"cna":{"title":"CVE-2026-4893","descriptions":[{"lang":"en","value":"An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information."}],"affected":[{"vendor":"dnsmasq","product":"dnsmasq","versions":[{"version":"0","status":"affected","lessThan":"2.92rel2","versionType":"custom"}]}],"references":[{"url":"https://www.kb.cert.org/vuls/id/471747"},{"url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"},{"url":"https://thekelleys.org.uk/dnsmasq/CVE/"},{"url":"https://github.com/NixOS/nixpkgs/pull/519093"},{"url":"https://github.com/NixOS/nixpkgs/pull/519082"},{"url":"https://github.com/pi-hole/FTL/releases/tag/v6.6.2"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-287: Improper Authentication"}]}],"providerMetadata":{"shortName":"certcc","orgId":"37e5125f-f79b-445b-8fad-9564f167944b","dateUpdated":"2026-05-20T14:09:53.804Z"},"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"VINCE 3.0.41","env":"prod","origin":"https://cveawg.mitre.org/api/cve/CVE-2026-4893"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.3,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-05-11T18:28:57.486938Z","id":"CVE-2026-4893","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-11T18:29:00.767Z"}}]}}}