VDB
CVE-2026-40930
CVE-2026-40930
PUBLISHED
CVSS 5.4 MEDIUM
Reported by GitHub_M · Published June 4, 2026
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.
Risk Scores
CVSS v3.1
5.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| pnggroup | libpng | = 1.8.0 |
| pnggroup | libpng-apng | >= 1.6.49, <= 1.6.57 |
| alpine | libpng | 0, 0, 0 |
| pnggroup | libpng-apng | >= 1.6.49, <= 1.6.57 |
| pnggroup | libpng | = 1.8.0 |
Timeline
- May 20, 2026 CVE Published
- Jun 4, 2026 CVE Updated
- Jun 9, 2026 Coalition ESS Score