LIBPNG is vulnerable to a heap buffer over-read in `png_write_image_8bit` with grayscale+alpha or RGB/RGBA images
CVE-2025-64506 is fixed in 15 products on 1 platform, first by libpng-tools 1.6.34-1ubuntu0.18.04.2+esm1, released November 24, 2025. It is not reported as exploited. Patch Radar priority: Routine.
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, a heap buffer over-read vulnerability exists in libpng's png_write_image_8bit function when processing 8-bit images through the simplified write API with convert_to_8bit enabled. The vulnerability affects 8-bit grayscale+alpha, RGB/RGBA, and images with incomplete row data. A conditional guard incorrectly allows 8-bit input to enter code expecting 16-bit input, causing reads up to 2 bytes beyond allocated buffer boundaries. This issue has been patched in version 1.6.51.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| firefox · amzn 2023 | 140.5.0-1.amzn2023.0.2 | ALAS2023-2025-1305 | Dec 8, 2025 |
| firefox-debuginfo · amzn 2023 | 140.5.0-1.amzn2023.0.2 | ALAS2023-2025-1305 | Dec 8, 2025 |
| firefox-debugsource · amzn 2023 | 140.5.0-1.amzn2023.0.2 | ALAS2023-2025-1305 | Dec 8, 2025 |
| libpng · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-debuginfo · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-debugsource · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-devel · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-devel-debuginfo · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-static · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-tools · Ubuntu 18.04.6 LTS (bionic) | 1.6.34-1ubuntu0.18.04.2+esm1 | libpng-tools 1.6.34-1ubuntu0.18.04.2+esm1 | Nov 24, 2025 |
| libpng-tools · Ubuntu 20.04 LTS (focal) | 1.6.37-2ubuntu0.1~esm1 | libpng-tools 1.6.37-2ubuntu0.1~esm1 | Nov 24, 2025 |
| libpng-tools · Ubuntu 22.04.1 LTS (jammy) | 1.6.37-3ubuntu0.1 | libpng-tools 1.6.37-3ubuntu0.1 | Nov 24, 2025 |
| libpng-tools · Ubuntu 24.04.5 LTS (noble) | 1.6.43-5ubuntu0.1 | libpng-tools 1.6.43-5ubuntu0.1 | Nov 24, 2025 |
| libpng-tools · Ubuntu 25.10 (questing) | 1.6.50-1ubuntu0.1 | libpng-tools 1.6.50-1ubuntu0.1 | Nov 24, 2025 |
| libpng-tools · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng-tools-debuginfo · amzn 2023 | 2:1.6.37-10.amzn2023.0.7 | ALAS2023-2025-1306 | Dec 8, 2025 |
| libpng1.6 · Debian 12.15 (bookworm) | 1.6.39-2+deb12u1 | DEBIAN-CVE-2025-64506 | Nov 25, 2025 |
| libpng1.6 · Debian 13.5 (trixie) | 1.6.48-1+deb13u1 | DEBIAN-CVE-2025-64506 | Nov 25, 2025 |
| libpng1.6 · Debian 14 | 1.6.51-1 | DEBIAN-CVE-2025-64506 | Nov 25, 2025 |
| libpng16 · opensuse-leap 15.6 | 1.6.40-150600.3.3.1 | SUSE-SU-2025:4494-1 | Dec 19, 2025 |
| libpng16 · opensuse-leap 16.0 | 1.6.44-160000.3.1 | OPENSUSE-SU-2026:20017-1 | Jan 12, 2026 |
| libpng16 · sles 15.6 | 1.6.40-150600.3.3.1 | SUSE-SU-2025:4494-1 | Dec 19, 2025 |
| libpng16 · sles 15.7 | 1.6.40-150600.3.3.1 | SUSE-SU-2025:4494-1 | Dec 19, 2025 |
| libpng16 · sles 16.0 | 1.6.44-160000.3.1 | SUSE-SU-2026:20030-1 | Jan 12, 2026 |
| libpng16-16 · Ubuntu 18.04.6 LTS (bionic) | 1.6.34-1ubuntu0.18.04.2+esm1 | libpng16-16 1.6.34-1ubuntu0.18.04.2+esm1 | Nov 24, 2025 |
| libpng16-16 · Ubuntu 20.04 LTS (focal) | 1.6.37-2ubuntu0.1~esm1 | libpng16-16 1.6.37-2ubuntu0.1~esm1 | Nov 24, 2025 |
| libpng16-16 · Ubuntu 22.04.1 LTS (jammy) | 1.6.37-3ubuntu0.1 | libpng16-16 1.6.37-3ubuntu0.1 | Nov 24, 2025 |
| libpng16-16t64 · Ubuntu 24.04.5 LTS (noble) | 1.6.43-5ubuntu0.1 | libpng16-16t64 1.6.43-5ubuntu0.1 | Nov 24, 2025 |
| libpng16-16t64 · Ubuntu 25.10 (questing) | 1.6.50-1ubuntu0.1 | libpng16-16t64 1.6.50-1ubuntu0.1 | Nov 24, 2025 |
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