CVE-2026-40930

Published: Jun 4, 2026Modified: Jul 22, 2026

5.4

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Exploitability: 2.8 / Impact: 2.5

Source: security-advisories@github.com (Secondary)

Description

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.

Related CWEs

CWE-436

Interpretation Conflict

Product A handles inputs or steps differently than Product B, which causes A to perform incorrect actions based on its perception of B's state.

References (3)

https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4

Source: security-advisories@github.com

https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x

Source: security-advisories@github.com

http://www.openwall.com/lists/oss-security/2026/05/15/21

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.