CVE-2026-65969: OpenImageIO: TGA-to-GIF palette split signed overflow causes SIGSEGV

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-09-18 · updated 2026-09-29
Weakness: CWE-125

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.

Affected products

OpenImageIO Project OpenImageIO: before 3.0.21.0; from 3.1.0.0 through 3.1.16.0; 3.2.0.0-dev, 3.2.0.2-dev — fixed in 3.0.21.0

How to fix

Upgrade to a fixed version: OpenImageIO Project OpenImageIO 3.0.21.0. Check the vendor advisory for mitigations.

References

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