Vulnerability · Published Apr 3, 2026 · Assigned by GitHub_M
CVE-2026-34933Avahi: Reachable assertion in `transport_flags_from_domain()` via conflicting publish flags crashes avahi-daemon
Medium 5.5
In plain English
A medium-severity security flaw in avahi from avahi. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 89.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | avahi | 0.8-r26 | ALPINE-CVE-2026-34933 |
| Debian:12 | avahi | no fix listed | DEBIAN-CVE-2026-34933 |
| Debian:13 | avahi | no fix listed | DEBIAN-CVE-2026-34933 |
| Debian:14 | avahi | no fix listed | DEBIAN-CVE-2026-34933 |
| Ubuntu:22.04:LTS | avahi | 0.8-5ubuntu5.5 | UBUNTU-CVE-2026-34933 |
| Ubuntu:24.04:LTS | avahi | 0.8-13ubuntu6.2 | UBUNTU-CVE-2026-34933 |
| Ubuntu:25.10 | avahi | 0.8-16ubuntu3.2 | UBUNTU-CVE-2026-34933 |
| Ubuntu:26.04:LTS | avahi | 0.8-18ubuntu1.1 | UBUNTU-CVE-2026-34933 |
Affected products (as reported)
Weakness: CWE-617 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H