What’s Vulnerable › Vulnerabilities

CVE-2026-42144: CImg Library: Integer overflow in PNM size check bypasses memory guard (_load_pnm)

• Severity: medium (CVSS 6.1 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: 2026-05-04 · updated 2026-10-26
• Weakness: CWE-190

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 products

• GreycLab CImg: before 4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d

References

• https://github.com/GreycLab/CImg/commit/4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d
• https://github.com/GreycLab/CImg/issues/478
• https://github.com/GreycLab/CImg/releases/tag/v.3.7.5
• https://github.com/GreycLab/CImg/security/advisories/GHSA-4663-63fm-44gc

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