Avahi vulnerabilities
Summary
It is discovered that Avahi incorrectly handled crafted input. A remote attacker could possibly use this issue to crash the program, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-24401) Guillaume Meunier discovered that Avahi incorrectly handled crafted input. An attacker could possibly use this issue to crash the program, resulting in a denial of service. (CVE-2026-34933) Affected Ubuntu releases: 26.04, 25.10, 24.04, 22.04, 20.04, 18.04, 16.04, 14.04. CVEs: CVE-2026-34933, CVE-2026-24401.
- Ubuntu 26.04
- Ubuntu 25.10
- Ubuntu 24.04
- Ubuntu 22.04
- Ubuntu 20.04
- Ubuntu 18.04
- Ubuntu 16.04
- Ubuntu 14.04
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
- Apply available updates: `sudo apt update && sudo apt upgrade` (a standard system update installs the fix).
Official advisory · medium-confidence parse· fetched 3 hours ago·verify at source
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