CVE-2026-59181 OpenImageIO: Stack buffer overflow in OpenImageIO Cineon reader via unchecked numberOfElements
A stack buffer overflow in OpenImageIO's Cineon reader allows attackers to cause memory corruption and denial of service via a crafted file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-59181?
CVE-2026-59181 is a medium-severity memory corruption vulnerability in Openimageio Openimageio, published on 18 Sep 2026. It can only be exploited from the same machine or local network, 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 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, A crafted cineon file can supply a numberofelements value greater than the format maximum of eight. cineoninput::open() uses that unchecked value as the loop bound while filling the fixed strings[8] array, writing pointers beyond the stack buffer and into adjacent state, resulting in memory corruption and denial of service. The affected implementation is identified by src/cineon.imageio/cineoninput.cpp, CineonInput::open(), numberOfElements, and strings[8], which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.
Which versions are affected by CVE-2026-59181?
It affects 1 product.
Products include Openimageio Openimageio.
How do I fix CVE-2026-59181?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-59181 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59181 exists.
Other vulnerabilities in Openimageio Openimageio
Sources
Also known as DEBIAN-CVE-2026-59181, GHSA-xh8r-vmqq-56pp, UBUNTU-CVE-2026-59181.