========================================================================== Ubuntu Security Notice USN-8269-1 May 12, 2026
avahi vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in Avahi.
Software Description:
- avahi: IPv4LL network address configuration daemon
Details:
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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
avahi-daemon 0.8-18ubuntu1.1
Ubuntu 25.10
avahi-daemon 0.8-16ubuntu3.2
Ubuntu 24.04 LTS
avahi-daemon 0.8-13ubuntu6.2
Ubuntu 22.04 LTS
avahi-daemon 0.8-5ubuntu5.5
Ubuntu 20.04 LTS
avahi-daemon 0.7-4ubuntu7.3+esm2
Available with Ubuntu Pro
Ubuntu 18.04 LTS
avahi-daemon 0.7-3.1ubuntu1.3+esm4
Available with Ubuntu Pro
Ubuntu 16.04 LTS
avahi-daemon 0.6.32~rc+dfsg-1ubuntu2.3+esm5
Available with Ubuntu Pro
Ubuntu 14.04 LTS
avahi-daemon 0.6.31-4ubuntu1.3+esm5
Available with Ubuntu Pro
References:
https://ubuntu.com/security/notices/USN-8269-1
CVE-2026-24401, CVE-2026-34933
Package Information:
https://launchpad.net/ubuntu/+source/avahi/0.8-18ubuntu1.1
https://launchpad.net/ubuntu/+source/avahi/0.8-16ubuntu3.2
https://launchpad.net/ubuntu/+source/avahi/0.8-13ubuntu6.2
https://launchpad.net/ubuntu/+source/avahi/0.8-5ubuntu5.5
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