Interpretation Conflict in libpng - CVE-2026-40930
Published: May 15, 2026
Vulnerability identifier: #VU131563
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-40930
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libpng
Affected software:
libpng
libpng
Detailed vulnerability description
The vulnerability allows a remote attacker to modify rendered image content or cause a denial of service.
The vulnerability exists due to interpretation conflict in the push-mode APNG parser when processing a crafted APNG image containing an ignored ancillary chunk with an unconsumed chunk body. A remote attacker can send a specially crafted PNG image to modify rendered image content or cause a denial of service.
User interaction is required to open the malicious image, and only push-mode applications using png_process_data are affected.
How to mitigate CVE-2026-40930
Install security update from vendor's website.