Vulnerability · Published May 4, 2026 · Assigned by GitHub_M
CVE-2026-42144CImg Library: Integer overflow in PNM size check bypasses memory guard (_load_pnm)
Medium 6.1
In plain English
A medium-severity integer overflow in CImg from GreycLab. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cimg | no fix listed | DEBIAN-CVE-2026-42144 |
| Debian:13 | cimg | 3.5.2+dfsg-1+deb13u1 | DEBIAN-CVE-2026-42144 |
| Debian:14 | cimg | 3.5.2+dfsg-2 | DEBIAN-CVE-2026-42144 |
| Ubuntu:25.10 | cimg | no fix listed | UBUNTU-CVE-2026-42144 |
| Ubuntu:26.04:LTS | cimg | no fix listed | UBUNTU-CVE-2026-42144 |
| Ubuntu:26.10 | cimg | no fix listed | UBUNTU-CVE-2026-42144 |
Affected products (as reported)
Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
References
- https://github.com/GreycLab/CImg/security/advisories/GHSA-4663-63fm-44gc x_refsource_CONFIRM
- https://github.com/GreycLab/CImg/issues/478 x_refsource_MISC
- https://github.com/GreycLab/CImg/commit/4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d x_refsource_MISC
- https://github.com/GreycLab/CImg/releases/tag/v.3.7.5 x_refsource_MISC