{"id":"CVE-2026-24401","revision":"c8408b7e5a6945dca4d0ea9f354c5580","records":[{"revision":"c8408b7e5a6945dca4d0ea9f354c5580","observedAt":"2026-10-23T16:48:20.594+00:00","statement":{"source":"cve-program","id":"CVE-2026-24401","aliases":[],"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.","state":0,"publishedAt":"2026-01-24T01:25:02.294+00:00","modifiedAt":"2026-10-23T15:54:16.116+00:00","affected":[{"ecosystem":"Vendor product","name":"avahi","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"avahi\",\n                    \"product\": \"avahi\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.9-rc3\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-24401","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-24401","identifiers":["CVE-2026-24401"]},"retained":false,"historicalAffected":[]}],"coverage":[]}