Bug 2506064

Summary: CVE-2026-47667 krita: CImg Library: Denial of service due to unbounded memory allocation in image file processing. [epel-all]
Product: [Fedora] Fedora EPEL Reporter: TEJ RATHI <trathi>
Component: kritaAssignee: Than Ngo <than>
Status: ASSIGNED --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: epel10CC: josh, kde-sig, ngompa13, than
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["16eb5678-cb45-443f-874c-eeef797ba466"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2504503    

Description TEJ RATHI 2026-07-22 11:13:46 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

CImg Library is a C++ library for image processing. Prior to version 4.0.0 in `_load_analyze()`, the header_size field is read as an `unsigned int` from the first 4 bytes of an Analyze/NIfTI file and passed directly to `new unsigned char[header_size]` without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent `fread` returns `short`  as it will for any malformed file), the function throws a `CImgIOException` and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via `load_analyze()` and the generic `load()` when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue.