CVE-2026-25646

Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. Prior to 1.6.55, an out-of-bounds read vulnerability exists in the png_set_quantize() API function. When the function is called with no histogram and the number of colors in the palette is more than twice the maximum supported by the user's display, certain palettes will cause the function to enter into an infinite loop that reads past the end of an internal heap-allocated buffer. The images that trigger this vulnerability are valid per the PNG specification. This vulnerability is fixed in 1.6.55.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25646.json

https://github.com/pnggroup/libpng/security/advisories/GHSA-g8hp-mq4h-rqm3

https://github.com/pnggroup/libpng/commit/01d03b8453eb30ade759cd45c707e5a1c7277d88

https://bugzilla.redhat.com/show_bug.cgi?id=2438542

https://access.redhat.com/security/cve/CVE-2026-25646

https://access.redhat.com/errata/RHSA-2026:9687

https://access.redhat.com/errata/RHSA-2026:9686

https://access.redhat.com/errata/RHSA-2026:9255

https://access.redhat.com/errata/RHSA-2026:9254

https://access.redhat.com/errata/RHSA-2026:8748

https://access.redhat.com/errata/RHSA-2026:8747

https://access.redhat.com/errata/RHSA-2026:8746

https://access.redhat.com/errata/RHSA-2026:7243

https://access.redhat.com/errata/RHSA-2026:7239

https://access.redhat.com/errata/RHSA-2026:7036

https://access.redhat.com/errata/RHSA-2026:7035

https://access.redhat.com/errata/RHSA-2026:7034

https://access.redhat.com/errata/RHSA-2026:7033

https://access.redhat.com/errata/RHSA-2026:7032

https://access.redhat.com/errata/RHSA-2026:6732

https://access.redhat.com/errata/RHSA-2026:6553

https://access.redhat.com/errata/RHSA-2026:6469

https://access.redhat.com/errata/RHSA-2026:6468

https://access.redhat.com/errata/RHSA-2026:6467

https://access.redhat.com/errata/RHSA-2026:6466

https://access.redhat.com/errata/RHSA-2026:6445

https://access.redhat.com/errata/RHSA-2026:6439

https://access.redhat.com/errata/RHSA-2026:5606

https://access.redhat.com/errata/RHSA-2026:4756

https://access.redhat.com/errata/RHSA-2026:4732

https://access.redhat.com/errata/RHSA-2026:4731

https://access.redhat.com/errata/RHSA-2026:4730

https://access.redhat.com/errata/RHSA-2026:4729

https://access.redhat.com/errata/RHSA-2026:4728

https://access.redhat.com/errata/RHSA-2026:4501

https://access.redhat.com/errata/RHSA-2026:4306

https://access.redhat.com/errata/RHSA-2026:4222

https://access.redhat.com/errata/RHSA-2026:4221

https://access.redhat.com/errata/RHSA-2026:3969

https://access.redhat.com/errata/RHSA-2026:3968

https://access.redhat.com/errata/RHSA-2026:3577

https://access.redhat.com/errata/RHSA-2026:3576

https://access.redhat.com/errata/RHSA-2026:3575

https://access.redhat.com/errata/RHSA-2026:3574

https://access.redhat.com/errata/RHSA-2026:3573

https://access.redhat.com/errata/RHSA-2026:3551

https://access.redhat.com/errata/RHSA-2026:3405

https://access.redhat.com/errata/RHSA-2026:3031

https://access.redhat.com/errata/RHSA-2026:17596

https://access.redhat.com/errata/RHSA-2026:16174

https://access.redhat.com/errata/RHSA-2026:15087

https://access.redhat.com/errata/RHSA-2026:14773

https://access.redhat.com/errata/RHSA-2026:12274

https://access.redhat.com/errata/RHSA-2026:10097

http://www.openwall.com/lists/oss-security/2026/02/09/7

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS