CVE-2026-65969 OpenImageIO: TGA-to-GIF palette split signed overflow causes SIGSEGV
A signed integer overflow in OpenImageIO's GIF palette processing allows attackers to cause a denial of service via a crafted TGA 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-2026-65969?
CVE-2026-65969 is a medium-severity 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 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1, A truncated tga can leave a pending gif frame that is processed during output close. gifsplitpalette() computes numpixels multiplied by the palette partition width in signed 32-bit arithmetic; a large image overflows that intermediate, corrupts subpixelsa, and drives an out-of-bounds read while building the gif palette, resulting in a process crash and denial of service. The affected implementation is identified by src/gif.imageio/gif.h, GifSplitPalette(), numPixels, subPixelsA, GIFOutput, and truncated TGA input, which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.21.0, 3.1.16.0, and 3.2.0.3-beta1.
Which versions are affected by CVE-2026-65969?
It affects 1 product.
Products include Openimageio Openimageio.
How do I fix CVE-2026-65969?
Upgrade to a fixed version.
Is CVE-2026-65969 being exploited?
There is no known exploitation of CVE-2026-65969 in the wild and no public exploit code.
Other vulnerabilities in Openimageio Openimageio
Sources
Also known as DEBIAN-CVE-2026-65969, GHSA-9mwc-fjgj-8wmq, UBUNTU-CVE-2026-65969.