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NVD Vulnerability Details :

CVE-2026-40930

Awaiting Analysis

Source-security-advisories@github.com

Published At-04 Jun, 2026 | 16:16

Updated At-04 Jun, 2026 | 16:23

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

Type: Secondary

Version: 3.1

Base score: 5.4

Base severity: MEDIUM

Vector:

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

Weaknesses

CWE ID	Type	Source
CWE-436	Primary	security-advisories@github.com

CWE ID: CWE-436

Type: Primary

Source: security-advisories@github.com

References

Hyperlink	Source	Resource
https://github.com/pnggroup/libpng/commit/faf06924688b62d7c1654b5ceddedbde66ffadb4	security-advisories@github.com	N/A
https://github.com/pnggroup/libpng/security/advisories/GHSA-c4v6-gxrq-6g2x	security-advisories@github.com	N/A
http://www.openwall.com/lists/oss-security/2026/05/15/21	af854a3a-2127-422b-91ae-364da2661108	N/A