Source: avahi Version: 0.8-17 Severity: important Tags: security upstream Forwarded: https://github.com/avahi/avahi/issues/501 X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerability was published for avahi. CVE-2026-24401[0]: | 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. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-24401 https://www.cve.org/CVERecord?id=CVE-2026-24401 [1] https://github.com/avahi/avahi/issues/501 [2] https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3 [3] https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
