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

Quick assessment

Affected
GreycLab CImg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CImg是GREYC开源的一个用于图像处理的小型开源 C++ 工具包。 CImg存在输入验证错误漏洞，该漏洞源于_load_pnm函数中WHD大小计算存在整数溢出，可能导致分配过小缓冲区并触发堆缓冲区溢出。

CVSS 6.1 · Medium EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
GreycLab CImg < 4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d affected
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I. Basic Information for CVE-2026-42144

Vulnerability Information
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Vulnerability Title
CImg Library: Integer overflow in PNM size check bypasses memory guard (_load_pnm)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
CImg 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CImg是GREYC开源的一个用于图像处理的小型开源 C++ 工具包。 CImg存在输入验证错误漏洞，该漏洞源于_load_pnm函数中W*H*D大小计算存在整数溢出，可能导致分配过小缓冲区并触发堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GreycLab CImg < 4ca26bce4d8c61fcd1507d5f9401b9fb1222c27d -

II. Public POCs for CVE-2026-42144

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III. Intelligence Information for CVE-2026-42144

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Patches & Fixes for CVE-2026-42144 (2)

Vendor Advisories for CVE-2026-42144 (1)

Security Blog Posts for CVE-2026-42144 (1)

IV. Related Vulnerabilities

Same product: CImg
Same vendor: GreycLab
Same weakness: CWE-190

V. Comments for CVE-2026-42144

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