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CVE-2026-25646

Libpng buffer overflow

8.1 HIGHPublic exploitEPSS 0.72%
  1. Published10 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Libpng< 1.6.55

Remediation

Fixed in
Libpng≥ 1.6.55

References

and 41 more references

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Frequently asked

Is CVE-2026-25646 being actively exploited?

CVE-2026-25646 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-25646?

CVE-2026-25646 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-25646?

Affected products include Libpng.

How do I fix CVE-2026-25646?

Upgrade affected software to a fixed version, for example Libpng 1.6.55 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-25646 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.