HIGH

CVE-2026-25646

CVSS v3

8.1

HIGH

EPSS Score

0.7 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for libpng.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libpngAlmaLinux:10all versions · fixed in 2:1.6.40-8.el10_1.2and 1 other package
libpngAlmaLinux:9all versions · fixed in 2:1.6.37-12.el9_7.2and 1 other package
libpngAlmaLinux:8all versions · fixed in 2:1.6.34-10.el8_10and 1 other package
libpng12AlmaLinux:8all versions · fixed in 1.2.57-6.el8_10
libpng15AlmaLinux:9all versions · fixed in 1.5.30-14.el9_7.1
libpng15AlmaLinux:8all versions · fixed in 1.5.30-8.el8_10
mingw32-libpngAlmaLinux:8all versions · fixed in 1.6.34-2.el8_10and 3 other packages

Vendor advisories

CVE-2026-25646 Red Hat Product Security800 products fixed · 6 known affected
libpng: LIBPNG has a heap buffer overflow in png_set_quantize
libpng as a component of Red Hat Enterprise Linux 6 · libpng-devel as a component of Red Hat Enterprise Linux 6 · libpng-static as a component of Red Hat Enterprise Linux 6
RHSA-2026:80330 Red Hat Product Security13 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
RHSA-2026:17596 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.17.54 bug fix and security update
RHSA-2026:14773 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.15.64 bug fix and security update
RHSA-2026:15087 Red Hat Product Security4 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.65 bug fix and security update
RHSA-2026:16174 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat AI Inference Server 3.3.3 (Spyre)

44 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-02-10
Last Modified: 2026-02-13

Frequently asked questions

What is CVE-2026-25646?

Is CVE-2026-25646 actively exploited?

Active exploitation of CVE-2026-25646 has not been confirmed. Its EPSS score was 0.7% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-25646?

CVE-2026-25646 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Running libpng? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? CVE Watch alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database