Libpng PNM Converter Allows Local Code Execution

Summary

A flaw in the Libpng PNM converter can allow an attacker to execute malicious code on a local system. This affects the PNM converter tool and can be exploited by a local attacker. To protect your system, update Libpng to a version higher than 1.6.55.

What to do

No fix is available yet. Check with your software vendor for updates.

Affected software

Vendor	Product	Affected versions	Fix available
canonical	libpng	All versions	–
canonical	libpng	All versions	–
canonical	libpng1.6	All versions	–
canonical	libpng1.6	All versions	–
canonical	libpng1.6	All versions	–
canonical	libpng1.6	All versions	–
canonical	libpng1.6	All versions	–
canonical	libpng1.6	All versions	–

Original title

A flaw has been found in pnggroup libpng up to 1.6.55. Affected by this vulnerability is the function do_pnm2png of the file contrib/pngminus/pnm2png.c of the component pnm2png. This manipulation o...

Original description

A flaw has been found in pnggroup libpng up to 1.6.55. Affected by this vulnerability is the function do_pnm2png of the file contrib/pngminus/pnm2png.c of the component pnm2png. This manipulation of the argument width/height causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

osv CVSS3.1 5.3

osv CVSS4.0 6.9

https://ubuntu.com/security/CVE-2026-3713 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-3713 Third Party Advisory
https://github.com/pnggroup/libpng/issues/794 Third Party Advisory
https://github.com/biniamf/pocs/tree/main/pnm2png Third Party Advisory
https://github.com/pnggroup/libpng/ Third Party Advisory
https://vuldb.com/?ctiid.349658 Third Party Advisory
https://vuldb.com/?id.349658 Third Party Advisory
https://vuldb.com/?submit.761996 Third Party Advisory