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CVE-2025-64720

Libpng out-of-bounds read

7.1 HIGHPublic exploitEPSS 0.42%
  1. Published24 Nov 2025

Description

LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable Network Graphics) raster image files. From version 1.6.0 to before 1.6.51, an out-of-bounds read vulnerability exists in png_image_read_composite when processing palette images with PNG_FLAG_OPTIMIZE_ALPHA enabled. The palette compositing code in png_init_read_transformations incorrectly applies background compositing during premultiplication, violating the invariant component ≤ alpha × 257 required by the simplified PNG API. This issue has been patched in version 1.6.51.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected products

Libpng≥ 1.6.0 < 1.6.51

Remediation

Fixed in
Libpng≥ 1.6.51

References

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Frequently asked

Is CVE-2025-64720 being actively exploited?

CVE-2025-64720 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2025-64720?

CVE-2025-64720 has a CVSS 3.1 base score of 7.1, rated high. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2025-64720?

Affected products include Libpng.

How do I fix CVE-2025-64720?

Upgrade affected software to a fixed version, for example Libpng 1.6.51 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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