CVE-2026-40930

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

5.4 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

June 04, 2026

Last Modified

June 04, 2026

CWE ID

CWE-436

Source

NVD

Vendor

pnggroup

Product

libpng, libpng-apng

External References

https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4
https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x
http://www.openwall.com/lists/oss-security/2026/05/15/21

CVE-2026-40930

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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