[USN-8039-1] libpng vulnerability

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Ubuntu Security Notice USN-8039-1
February 12, 2026

libpng1.6 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

libpng could be made to crash if it opened a specially crafted file.

Software Description:
- libpng1.6: PNG (Portable Network Graphics) file library

Details:

It was discovered that the libpng simplified API incorrectly handled
quantizing RGB images. If a user or automated system were tricked into
opening a specially crafted PNG file, an attacker could use this issue to
cause libpng to crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 25.10
libpng16-16t64 1.6.50-1ubuntu0.4

Ubuntu 24.04 LTS
libpng16-16t64 1.6.43-5ubuntu0.5

Ubuntu 22.04 LTS
libpng16-16 1.6.37-3ubuntu0.4

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

References:
https://ubuntu.com/security/notices/USN-8039-1
CVE-2026-25646

Package Information:
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.50-1ubuntu0.4
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.43-5ubuntu0.5
https://launchpad.net/ubuntu/+source/libpng1.6/1.6.37-3ubuntu0.4