Vulnerability in Avahi
CVE-2026-34933
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (4.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Avahi — versions 0.9, < 0.9-rc4
Weakness classification (CWE)
References
- github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc (Exploit, Patch, Vendor Advisory)
- github.com/avahi/avahi/pull/891 (Patch, Issue Tracking)
- github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c (Patch)
- af854a3a-2127-422b-91ae-364da2661108 (Exploit, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-34933?
- CVE-2026-34933 is a medium-severity vulnerability in Avahi, classified under Reachable Assertion. CVSS score: 5.5/10. Published 2026-04-03.
- How severe is CVE-2026-34933?
- Medium severity. CVSS v3 base score is 5.5 out of 10.