CVE-2026-25646

HIGH

8.1

CVSS v3

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.

CWE-122Heap-based Buffer Overflow CWE-126Buffer Over-read CWE-125Out-of-bounds Read

How to fix

Remediation Available

libpng1.6Debian

Fixed in:1.6.37-3+deb11u2CVE-2026-25646

Fixed in:1.6.39-2+deb12u3CVE-2026-25646

Fixed in:1.6.48-1+deb13u3CVE-2026-25646

Fixed in:1.6.55-1CVE-2026-25646

java-11-openjdkRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

java-11-openjdkRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

java-11-openjdk-debugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

java-11-openjdk-debugRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

java-11-openjdk-debuginfoRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-debuginfoRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-debugsourceRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-debugsourceRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-demoRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-demoRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-demo-debugRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

java-11-openjdk-demo-debugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

java-11-openjdk-demo-fastdebugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-demo-fastdebugRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-demo-slowdebugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-demo-slowdebugRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-develRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-develRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-debugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

java-11-openjdk-devel-debugRocky

Fixed in:1:11.0.31.0.11-1.el7_9RHSA-2026:9254

java-11-openjdk-devel-debuginfoRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-debuginfoRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-fastdebugRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-fastdebugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-fastdebug-debuginfoRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-fastdebug-debuginfoRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-slowdebugRed Hat / RHEL

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-slowdebugRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

java-11-openjdk-devel-slowdebug-debuginfoRocky

Fixed in:1:11.0.31.0.11-1.el8RHSA-2026:9254

Fixed in:1:11.0.31.0.11-1.el9RHSA-2026:9254

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.95%probability of exploitation in 30 days

58thpercentile

Moderate risk: more likely to be exploited than 58% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Mailing List1

openwall.com

Other references47

Related Vulnerabilities

Other CWE-122 (Heap-based Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2024-26256	High	7.8	88%	-	Fix
CVE-2020-25687	Medium	5.9	87%	-	Fix
CVE-2009-3459	High	8.8	87%	KEV	Fix
CVE-2021-21017	High	8.8	86%	KEV	-
CVE-2020-25683	Medium	5.9	86%	-	Fix

Common questions

How do I fix CVE-2026-25646?

Published advisories record a fix for 148 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-25646 being actively exploited?

Not that we know of. CVE-2026-25646 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.95% is the estimated probability that it will be exploited in the next 30 days. That is higher than 58% of all scored CVEs.

How severe is CVE-2026-25646?

CVE-2026-25646 has a CVSS v3 base score of 8.1, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-25646 affect?

Published advisories record a fix for libpng1.6 (Debian), java-11-openjdk (Red Hat / RHEL), java-11-openjdk (Rocky), java-11-openjdk-debug (Red Hat / RHEL), and 144 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-11.