CVE-2026-24401

MEDIUM EPSS 16.4%
Published Jan 24, 20265mo ago · Modified Jun 17, 20261w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Jan 24, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
16.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-674

Affected Products 3

VendorProductVersionRange
avahiavahi* <0.9
avahiavahi0.9any
avahiavahi0.9any

References 3

  • github.com https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524
    Patch
  • github.com https://github.com/avahi/avahi/issues/501
    Issue TrackingPatch
  • github.com https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3
    Vendor Advisory

Remediation

  • github.com https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524
    Patch
  • github.com https://github.com/avahi/avahi/issues/501
    Issue TrackingPatch