Bug 2454139 (CVE-2026-34545)

Summary: CVE-2026-34545 OpenEXR: OpenEXR: Remote code execution via crafted EXR files
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenEXR, an image storage format for the motion picture industry. An attacker can exploit this vulnerability by providing a specially crafted .exr file with HTJ2K compression and a specific channel width. This allows controlled data to be written beyond the output heap buffer, leading to a heap write overflow. This issue can ultimately result in remote code execution on systems that decode these malicious EXR images.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2454252, 2454253, 2454251, 2454254    
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Description OSIDB Bzimport 2026-04-01 22:02:39 UTC 
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.