CVE-2026-40930
CVE-2026-40930 · LIBPNG: Chunk smuggling in push-mode APNG parser via unconsumed chunk body
This page contains facts from public vulnerability sources. Check the original advisory before updating.
LIBPNG is a reference library for use in applications that process PNG (Portable Network Graphics) raster image files. In version 1.8.0, three inter-frame chunk discard paths in the push-mode APNG parser clear the chunk-header flag without consuming the chunk body and CRC, allowing attacker-controlled bytes inside an ignored ancillary chunk to be reinterpreted as a fresh chunk header on the next call to `png_process_data`. Commit faf06924688b62d7c1654b5ceddedbde66ffadb4 fixes the issue.
CVSS 5.4 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
libpng
- Versions
- = 1.8.0: Affected
No fix published
libpng-apng
- Versions
- >= 1.6.49, <= 1.6.57: Affected
No fix published
libpng1.6 Debian:12
- Affected ranges
- ECOSYSTEM: < 1.6.37-4
Update to 1.6.37-4
libpng1.6 Debian:13
- Affected ranges
- ECOSYSTEM: < 1.6.37-4
Update to 1.6.37-4
libpng1.6 Debian:14
- Affected ranges
- ECOSYSTEM: < 1.6.37-4
Update to 1.6.37-4
libpng1.6 Ubuntu:Pro:20.04:LTS
- Versions
- 1.6.37-1
- 1.6.37-2
- 1.6.37-2ubuntu0.1~esm1
- 1.6.37-2ubuntu0.1~esm2
- Affected ranges
- ECOSYSTEM: < 1.6.37-2ubuntu0.1~esm3
Update to 1.6.37-2ubuntu0.1~esm3
libpng1.6 Ubuntu:22.04:LTS
- Versions
- 1.6.37-3build4
- 1.6.37-3build5
- 1.6.37-3ubuntu0.1
- 1.6.37-3ubuntu0.3
- 1.6.37-3ubuntu0.4
- 1.6.37-3ubuntu0.5
- Affected ranges
- ECOSYSTEM: < 1.6.37-3ubuntu0.6
Update to 1.6.37-3ubuntu0.6