CVE-2025-66293LIBPNG has an out-of-bounds read in png_image_read_composite

Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.52, an out-of-bounds read vulnerability in libpng's simplified API allows reading up to 1012 bytes beyond the png_sRGB_base[512] array when processing valid palette PNG images with partial transparency and gamma correction. The PNG files that trigger this vulnerability are valid per the PNG specification; the bug is in libpng's internal state management. Upgrade to libpng 1.6.52 or later.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/pnggroup/libpng/security/advisories/GHSA-9mpm-9pxh-mg4f ExploitVendor Advisory
• https://github.com/pnggroup/libpng/issues/764 ExploitIssue TrackingPatch
• https://github.com/pnggroup/libpng/commit/788a624d7387a758ffd5c7ab010f1870dea753a1 Patch
• https://github.com/pnggroup/libpng/commit/a05a48b756de63e3234ea6b3b938b8f5f862484a Patch
• http://www.openwall.com/lists/oss-security/2025/12/03/6 Mailing List
• http://www.openwall.com/lists/oss-security/2025/12/03/7 Mailing List
• http://www.openwall.com/lists/oss-security/2025/12/03/8 Mailing List