Bug 2466483 (CVE-2026-42146)

Summary: CVE-2026-42146 CImg: CImg Library: Denial of Service via crafted BMP file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in CImg Library. A remote attacker can exploit this vulnerability by providing a specially crafted BMP (Bitmap) image file. This occurs because the `nb_colors` field in the BMP file header is used directly to compute an allocation size without proper validation against the remaining file size. Successful exploitation can lead to an out-of-memory condition, causing applications that use CImg to load untrusted BMP files to crash, resulting in a Denial of Service (DoS).
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Bug Depends On: 2467995    
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Description OSIDB Bzimport 2026-05-04 19:01:34 UTC 
CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.