Buffer overflow in Pnggroup Libpng
CVE-2026-3713
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- Pnggroup Libpng — versions 1.6.0, 1.6.1, 1.6.2
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/pnggroup/libpng/issues/794 (issue-tracking)
- github.com/biniamf/pocs/tree/main/pnm2png (exploit)
- github.com/pnggroup/libpng/ (product)
Frequently asked questions
- What is CVE-2026-3713?
- CVE-2026-3713 is a medium-severity vulnerability in Pnggroup Libpng, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-03-08.
- How severe is CVE-2026-3713?
- Medium severity. CVSS v3 base score is 5.3 out of 10.