Bug 2455411 (CVE-2026-34589)

Summary: CVE-2026-34589 OpenEXR: OpenEXR: Memory corruption leading to arbitrary code execution or denial of service
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: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in OpenEXR. The DWA lossy decoder, responsible for processing EXR image files, incorrectly handles large image widths. This occurs because temporary block pointers are constructed using signed 32-bit arithmetic, which can overflow. A remote attacker could exploit this by providing a specially crafted EXR file, leading to memory corruption and potentially arbitrary code execution or denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2455499, 2455500, 2455498, 2455501    
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Description OSIDB Bzimport 2026-04-06 16:03:13 UTC 
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.