Bug 2523740 (CVE-2026-68513)

Summary: CVE-2026-68513 OpenEXR: OpenEXR: Heap buffer overflow in PyOpenEXR allows arbitrary code execution via crafted 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 PyOpenEXR, a component of OpenEXR. A heap buffer overflow can occur when processing a specially crafted EXR image file. This vulnerability is triggered by a channel-name key collision between literal and prefixed RGB channels, causing the software to write data beyond the allocated memory buffer. An attacker could exploit this by tricking a user into opening a malicious EXR file, potentially leading to arbitrary code execution or a denial of service.
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Description OSIDB Bzimport 2026-08-25 19:30:01 UTC 
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13 contain a heap buffer overflow in PyOpenEXR triggered by a channel-name key collision between literal and prefixed RGB channels. When separate_channels=false, PyOpenEXR maps each physical channel name through channelNameToRGBA() and coalesces the results into a shared RGB array. A crafted flat scanline EXR that contains both a literal channel such as left and prefixed channels such as left.R, left.G, and left.B causes these names to collide, so the wrapper reuses an undersized two-dimensional NumPy array for the coalesced RGB slices and writes out of bounds when OpenEXR.File(path) decodes the pixels. This issue is fixed in versions 3.3.13 and 3.4.14.