oss-security - libpng 1.6.51: Four buffer overflow vulnerabilities fixed: CVE-2025-64505, CVE-2025-64506, CVE-2025-64720, CVE-2025-65018

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Message-ID: <CAAoVtZw-pkvsSTaXAHjDdUC3NRDwvwVNT8D4BpO5z3d79W-FVg@mail.gmail.com>
Date: Sat, 22 Nov 2025 03:27:35 +0200
From: Cosmin Truta <ctruta@...il.com>
To: oss-security@...ts.openwall.com
Subject: libpng 1.6.51: Four buffer overflow vulnerabilities fixed:
 CVE-2025-64505, CVE-2025-64506, CVE-2025-64720, CVE-2025-65018

Hello, everyone,

libpng 1.6.51 has been released to address four buffer overflow
vulnerabilities discovered through fuzzing and security research.
This release fixes two high-severity and two moderate-severity CVEs
affecting libpng 1.6.0 through 1.6.50.

CVE-2025-64505 (CVSS 6.1, Moderate): Heap buffer over-read in
png_do_quantize via malformed palette index.

CVE-2025-64506 (CVSS 6.1, Moderate): Heap buffer over-read in
png_write_image_8bit with 8-bit input and convert_to_8bit enabled.

CVE-2025-64720 (CVSS 7.1, High): Out-of-bounds read in
png_image_read_composite via palette premultiplication with
PNG_FLAG_OPTIMIZE_ALPHA.

CVE-2025-65018 (CVSS 7.1, High): Heap buffer overflow in
png_combine_row triggered via png_image_finish_read when processing
16-bit interlaced PNGs with 8-bit output format.

All vulnerabilities require user interaction (processing a malicious
PNG file) and can result in information disclosure and/or denial of
service. CVE-2025-65018 may enable arbitrary code execution via heap
corruption in certain heap configurations.

GitHub Security Advisories:
- CVE-2025-64505:
https://github.com/pnggroup/libpng/security/advisories/GHSA-4952-h5wq-4m42
- CVE-2025-64506:
https://github.com/pnggroup/libpng/security/advisories/GHSA-qpr4-xm66-hww6
- CVE-2025-64720:
https://github.com/pnggroup/libpng/security/advisories/GHSA-hfc7-ph9c-wcww
- CVE-2025-65018:
https://github.com/pnggroup/libpng/security/advisories/GHSA-7wv6-48j4-hj3g

Fixes:
- CVE-2025-64505:
https://github.com/pnggroup/libpng/commit/6a528eb5fd0dd7f6de1c39d30de0e41473431c37
- CVE-2025-64506:
https://github.com/pnggroup/libpng/commit/2bd84c019c300b78e811743fbcddb67c9d9bf821
- CVE-2025-64720:
https://github.com/pnggroup/libpng/commit/08da33b4c88cfcd36e5a706558a8d7e0e4773643
- CVE-2025-65018:
https://github.com/pnggroup/libpng/commit/16b5e3823918840aae65c0a6da57c78a5a496a4d

https://github.com/pnggroup/libpng/commit/218612ddd6b17944e21eda56caf8b4bf7779d1ea

Note: CVE-2025-65018 requires both commits for correct remediation.

Release: https://github.com/pnggroup/libpng/releases/tag/v1.6.51

Credit: Samsung-PENTEST (CVE-2025-64505, CVE-2025-64506, CVE-2025-64720),
weijinjinnihao (CVE-2025-64506), yosiimich (CVE-2025-65018), with analysis
by Fabio Gritti and John Bowler.

Users should upgrade to libpng 1.6.51 immediately.

Cosmin Truta
libpng maintainer

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