{"id":"AZL-75204","summary":"CVE-2026-24401 affecting package avahi for versions less than 0.8-5","details":"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.","modified":"2026-04-21T04:38:52.447667Z","published":"2026-01-24T02:15:48Z","upstream":["CVE-2026-24401"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-24401"}],"affected":[{"package":{"name":"avahi","ecosystem":"Azure Linux:2","purl":"pkg:rpm/azure-linux/avahi"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8-5"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-75204.json"}}],"schema_version":"1.7.5"}