Bug 2523655 (CVE-2026-59186)

Summary: CVE-2026-59186 OpenEXR: OpenEXR: Heap out-of-bounds write via crafted tiled EXR file
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in OpenEXR, a widely used image format library. A remote attacker could exploit this by providing a specially crafted tiled EXR file. When processed on a 32-bit system, an integer overflow occurs during buffer size calculation, leading to a heap out-of-bounds write. This could result in a denial of service or potentially lead to other impacts.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2537154, 2537155, 2537156    
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Description OSIDB Bzimport 2026-08-25 16:46:43 UTC 
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions before 3.2.11, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13, a crafted tiled EXR can trigger a heap out-of-bounds write on 32-bit/ILP32 builds when read through the public TiledRgbaInputFile RGBA API. The file uses a small 40x40 dataWindow but a 65537x65537 tile size. On ILP32, the Array2D<Rgba> tile-conversion buffer size calculation overflows, allocates a much smaller heap buffer, and tile decode writes past that allocation. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.
Comment 2 Jon Orris 2026-10-13 17:13:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:82345 https://access.redhat.com/errata/RHSA-2026:82345