Affected: Alpaquita:23: avahi, Alpaquita:25: avahi, Alpaquita:stream: avahi

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.

Affected: openEuler:22.03-LTS-SP4: avahi, openEuler:24.03-LTS: avahi, openEuler:24.03-LTS-SP1: avahi, openEuler:24.03-LTS-SP2: avahi, openEuler:24.03-LTS-SP3: avahi, openEuler:20.03-LTS-SP4: avahi

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. This enables you to plug your laptop or computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared. Security Fix(es):

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.(CVE-2026-24401)

avahi-0.8-44.1 on GA media

avahi: Avahi: Denial of Service via D-Bus record browsers with AVAHI_LOOKUP_USE_WIDE_AREA flag avahi: Avahi: Denial of Service via crafted mDNS/DNS-SD announcements avahi: Avahi: Denial of Service via unsolicited CNAME announcements avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response avahi: avahi-daemon: Avahi: Denial of Service via D-Bus method call

Security update for avahi

Affected: Ubuntu:Pro:14.04:LTS: avahi, Ubuntu:Pro:16.04:LTS: avahi, Ubuntu:Pro:18.04:LTS: avahi, Ubuntu:Pro:20.04:LTS: avahi, Ubuntu:22.04:LTS: avahi, Ubuntu:24.04:LTS: avahi, Ubuntu:25.10: avahi

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.

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in avahi-daemon ausnutzen, um einen Denial of Service Angriff durchzuführen.