CVE-2026-43909: OpenImageIO: Signed integer overflow in SwapRGBABytes loop index leads to out-of-bounds read/write in DPX ABGR decoder
Last updated 22 May 2026
Other sources
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.
— NVD
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/openimageioto a version that resolves this vulnerability.Fixed in 3.0.18.0 - Upgrade
Upgrade
debian/openimageioto a version that resolves this vulnerability.Fixed in 3.1.13.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-43909?
CVE-2026-43909 is categorized as a medium-severity vulnerability due to the potential for out-of-bounds read/write operations.
How do I fix CVE-2026-43909?
To fix CVE-2026-43909, upgrade OpenImageIO to version 3.0.18.0 or later, or to version 3.1.13.0 or later.
What are the impacts of CVE-2026-43909?
CVE-2026-43909 can lead to potential crashes or undefined behavior when decoding DPX ABGR image formats.
Which versions of OpenImageIO are affected by CVE-2026-43909?
CVE-2026-43909 affects OpenImageIO versions prior to 3.0.18.0 and 3.1.13.0.
Is CVE-2026-43909 exploitable remotely?
CVE-2026-43909 could be exploited if a user opens a malicious DPX ABGR file, making it a concern for applications that handle untrusted image files.