CVE-2025-68468: Avahi has a reachable assertion in lookup_multicast_callback

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-12 · updated 2026-06-17
Weakness: CWE-617

Description

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2 and earlier, avahi-daemon can be crashed by sending unsolicited announcements containing CNAME resource records pointing it to resource records with short TTLs. As soon as they expire avahi-daemon crashes.

Affected products

avahi: before 0.9; 0.9-rc1 — fixed in 0.9

How to fix

Upgrade to a fixed version: avahi 0.9. Check the vendor advisory for mitigations.

References

https://github.com/avahi/avahi/commit/f66be13d7f31a3ef806d226bf8b67240179d309a
https://github.com/avahi/avahi/issues/683
https://github.com/avahi/avahi/security/advisories/GHSA-cp79-r4x9-vf52

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