Bug 2477579 (CVE-2026-43909)

Summary: CVE-2026-43909 OpenImageIO: OpenImageIO: Arbitrary code execution or denial of service via integer overflow in image processing
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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Hardware: All   
OS: Linux   
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A flaw was found in OpenImageIO. A signed 32-bit integer overflow in the `SwapRGBABytes()` function, triggered when processing kABGR DPX images with large dimensions, can lead to an out-of-bounds read and write. This allows a remote attacker to potentially execute arbitrary code or cause a denial of service (DoS) by providing a specially crafted image file.
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Bug Depends On: 2477865, 2477866, 2477875    
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Description OSIDB Bzimport 2026-05-14 20:02:01 UTC 
OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.18.0 and 3.1.13.0, a signed 32-bit integer overflow in the loop index expression i * 4 inside SwapRGBABytes() causes the function to compute a large negative pointer offset when processing kABGR DPX images with large dimensions. The immediate crash is an out-of-bounds read (the memcpy at line 45 reads from &input[i * 4] first), but the subsequent write operations at lines 46–49 target the same wrapped offset — making this a combined OOB read+write primitive. This vulnerability is fixed in 3.0.18.0 and 3.1.13.0.