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OpenAdvisories
High USN-8039-1 1 CVE

libpng1.6 vulnerability

Published Feb 12, 2026 · Updated Oct 27, 2026

Ecosystem: Ubuntu

Summary

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.

Fixed packages 3

ReleasePackageFixed in
Ubuntu · 22.04 LTS 22.04:LTS libpng1.6 1.6.37-3ubuntu0.4
Ubuntu · 24.04 LTS 24.04:LTS libpng1.6 1.6.43-5ubuntu0.5
Ubuntu · 25.10 libpng1.6 1.6.50-1ubuntu0.4

Vulnerabilities 1

  • High 8.3
    CVE-2026-25646

    LIBPNG has a heap buffer overflow in png_set_quantize

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function i…

    pnggroup libpng openjpeg2 fltk Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://ubuntu.com/security/CVE-2026-25646