CVE-2026-42144 CImg Library: Integer overflow in PNM size check bypasses memory guard (_load_pnm)
Integer overflow in CImg library allows heap buffer overflow via crafted PNM files, potentially leading to code execution or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-42144?
CVE-2026-42144 is a medium-severity vulnerability in GreycLab CImg, published on 4 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
CImg Library is a C++ library for image processing. Prior to commit 4ca26bc, there is an integer overflow vulnerability in the W*H*D size computation inside _load_pnm() that can bypass the memory allocation guard. A crafted PNM/PGM/PPM file with large dimension values causes the overflow to wrap around, allocating an undersized buffer and potentially triggering a heap buffer overflow. Any application using CImg to load untrusted image files is affected. This issue has been patched via commit 4ca26bc.
Weakness: CWE-190
Which versions are affected by CVE-2026-42144?
How do I fix CVE-2026-42144?
Apply the vendor's patch.
Is CVE-2026-42144 being exploited?
There is no known exploitation of CVE-2026-42144 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-42144, GHSA-4663-63fm-44gc, UBUNTU-CVE-2026-42144.