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

> CVE-2025-64720: LIBPNG is vulnerable to a buffer overflow in `png_image_read_composite` via incorrect palette premultiplication. CVSS 7.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-64720
Last updated: 2026-10-18T20:10:00Z

- Published: 2025-11-24 23:45 UTC · Updated: 2026-10-18 20:10 UTC · Assigner: GitHub\_M
- CVSS: 7.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
- EPSS: 0.45%, 39th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: 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 vendors and products

- pnggroup: libpng

## Tracked companies

- [GitLab](https://rewindex.com/company/gitlab.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-64720)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-64720)
- [https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643](https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643)
- [https://github.com/pnggroup/libpng/issues/686](https://github.com/pnggroup/libpng/issues/686)
- [https://github.com/pnggroup/libpng/pull/751](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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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-64720 · Markdown: https://rewindex.com/cve/CVE-2025-64720.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-64720 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:26.960Z