What’s Vulnerable › Vulnerabilities

CVE-2025-64720: LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-25 · updated 2026-10-18
• Weakness: CWE-125

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.

Affected products

• pnggroup libpng: from 1.6.0 before 1.6.51 — fixed in 1.6.51

How to fix

Upgrade to a fixed version: pnggroup libpng 1.6.51. Check the vendor advisory for mitigations.

References

• https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643
• https://github.com/pnggroup/libpng/issues/686
• https://github.com/pnggroup/libpng/pull/751
• https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww
• https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww

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