Medium severity · published May 4, 2026
CVE-2026-42144
CImg Library: Integer overflow in PNM size check bypasses memory guard (_load_pnm)
6.1
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CI
CImg · GreycLab
< 4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42144
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42144
github.com
https://github.com/GreycLab/CImg/commit/4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d
github.com
https://github.com/GreycLab/CImg/issues/478
github.com
https://github.com/GreycLab/CImg/releases/tag/v.3.7.5
github.com
https://github.com/GreycLab/CImg/security/advisories/GHSA-4663-63fm-44gc
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