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Ubuntu Security Notice USN-8408-1
June 08, 2026

php-twig vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

Twig could be made to run programs if it received specially crafted network
traffic from an authenticated user.

Software Description:
- php-twig: Flexible, fast, and secure template engine for PHP

Details:

It was discovered that Twig did not properly validate PHP callables when
using a source policy. An authenticated user could possibly use this issue
to execute arbitrary code.

Update instructions:

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

Ubuntu 26.04 LTS
  php-twig                        3.23.0-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-8408-1
  CVE-2026-24425