Ubuntu Security Notices USN-8039-1 USN-8039-1: libpng vulnerability Publication date 12 February 2026 Overview libpng could be made to crash if it opened a specially crafted file. Releases 25.10 24.04 LTS 22.04 LTS Packages 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. 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 In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 25.10 questing libpng16-16t64 – 1.6.50-1ubuntu0.4 24.04 LTS noble libpng16-16t64 – 1.6.43-5ubuntu0.5 22.04 LTS jammy libpng16-16 – 1.6.37-3ubuntu0.4 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2026-25646 CVE-2026-25646 USN-8035-1 USN-8035-1