{"id":"CVE-2026-24401","state":"PUBLISHED","title":"Avahi has Uncontrolled Recursion in lookup_handle_cname function","description":"Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., \"h.local\" as a CNAME for \"h.local\"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524, which is part of version 0.9-rc3.","publishedAt":"2026-01-24T01:25:02.294Z","updatedAt":"2026-10-23T15:54:16.116Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["avahi avahi"],"affected":[{"vendor":"avahi","product":"avahi","versions":[{"version":"< 0.9-rc3","status":"affected"}]}],"references":["https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3","https://github.com/avahi/avahi/issues/501","https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524"],"weaknesses":["CWE-674"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/24xxx/CVE-2026-24401.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-24401","state":"PUBLISHED","datePublished":"2026-01-24T01:25:02.294Z","dateUpdated":"2026-10-23T15:54:16.116Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-22T18:19:49.172Z"},"containers":{"cna":{"title":"Avahi has Uncontrolled Recursion in lookup_handle_cname function","descriptions":[{"lang":"en","value":"Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., \"h.local\" as a CNAME for \"h.local\"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524, which is part of version 0.9-rc3."}],"affected":[{"vendor":"avahi","product":"avahi","versions":[{"version":"< 0.9-rc3","status":"affected"}]}],"references":[{"url":"https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3","name":"https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/avahi/avahi/issues/501","name":"https://github.com/avahi/avahi/issues/501","tags":["x_refsource_MISC"]},{"url":"https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524","name":"https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-674","lang":"en","description":"CWE-674: Uncontrolled Recursion","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-23T15:54:16.116Z"},"source":{"advisory":"GHSA-h4vp-5m8j-f6w3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-01-26T16:14:24.982686Z","id":"CVE-2026-24401","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":"2026-01-26T16:17:24.487Z"}}]}}}