CVE-2026-43909 OpenImageIO: Signed integer overflow in SwapRGBABytes loop index leads to out-of-bounds read/write in DPX ABGR decoder
A signed integer overflow in OpenImageIO's DPX decoder allows out-of-bounds read and write operations, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-43909?
CVE-2026-43909 is a high-severity vulnerability in Openimageio Openimageio, published on 14 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Which versions are affected by CVE-2026-43909?
It affects 1 product.
Products include Openimageio Openimageio.
How do I fix CVE-2026-43909?
Upgrade to a fixed version.
Is CVE-2026-43909 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43909 exists.
Other vulnerabilities in Openimageio Openimageio
Sources
Also known as DEBIAN-CVE-2026-43909, GHSA-g267-j53j-5258, UBUNTU-CVE-2026-43909.