CVE-2026-3713: pnggroup libpng pnm2png pnm2png.c do_pnm2png heap-based overflow

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-08 · updated 2026-06-17
Weakness: CWE-119

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.

Affected products

pnggroup libpng: 1.6.0, 1.6.1, 1.6.2, 1.6.3, 1.6.4, 1.6.5 (+50)

References

https://github.com/biniamf/pocs/tree/main/pnm2png
https://github.com/pnggroup/libpng/
https://github.com/pnggroup/libpng/issues/794
https://vuldb.com/?ctiid.349658
https://vuldb.com/?id.349658
https://vuldb.com/?submit.761996

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