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[USN-8518-1] mailcap vulnerability

Posted on 08 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8518-1
July 08, 2026

mailcap vulnerability
==========================================================================
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

Summary:

mailcap could allow applications to escape sandbox restrictions

Software Description:
- mailcap: Debian's mailcap system, and support programs

Details:

Aaron Rainbolt discovered that the cautious-launcher utility in the
mailcap package did not properly restrict the execution of certain
file types. An attacker could use this issue to escape a sandboxed
application and execute arbitrary code on the host operating system.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
mailcap 3.75ubuntu1.1

Ubuntu 25.10
mailcap 3.74ubuntu1.1

Ubuntu 24.04 LTS
mailcap 3.70+nmu1ubuntu1.24.04.1

Ubuntu 22.04 LTS
mailcap 3.70+nmu1ubuntu1.22.04.1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8518-1
CVE-2026-10037

Package Information:
https://launchpad.net/ubuntu/+source/mailcap/3.75ubuntu1.1
https://launchpad.net/ubuntu/+source/mailcap/3.74ubuntu1.1
https://launchpad.net/ubuntu/+source/mailcap/3.70+nmu1ubuntu1.24.04.1
https://launchpad.net/ubuntu/+source/mailcap/3.70+nmu1ubuntu1.22.04.1

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