CVE-2026-24401: Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In…
CVE-2026-24401 · Severity: medium · CVSS 6.5 · Published 2026-01-24
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-24401 being exploited in the wild.
How severe is CVE-2026-24401?
Medium severity, with a CVSS score of 6.5, published 24 January 2026.
Which products and versions are affected?
Avahi. The advisory does not name versions.
Is there a fix for CVE-2026-24401?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-24401?
Check whether you run Avahi. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.