Reachable assertion in Avahi - CVE-2026-34933
Published: April 9, 2026
Vulnerability identifier: #VU125663
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34933
CWE-ID: CWE-617
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: avahi.org
Affected software:
Avahi
Avahi
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to reachable assertion in transport_flags_from_domain() when handling D-Bus method calls with conflicting publish flags. A local user can send a specially crafted D-Bus method call to cause a denial of service.
The issue can be triggered through org.freedesktop.Avahi.EntryGroup methods that accept a flags parameter, and repeated crashes can result in persistent service disruption if the daemon is automatically restarted.
How to mitigate CVE-2026-34933
Install security update from vendor's website.