CVE-2026-65970 OpenImageIO: TIFF multithreaded scanline read use-after-scope in `TIFFInput::read_native_scanlines`
A crafted ZIP-compressed TIFF can cause a use-after-scope crash in OpenImageIO when multithreading is enabled, leading to denial of service.
- 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-2026-65970?
CVE-2026-65970 is a medium-severity use after free vulnerability in Openimageio Openimageio, published on 18 Sep 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 3.1.16.0, a crafted ZIP-compressed TIFF processed with TIFF multithreading enabled can make TIFFInput::read_native_scanlines() return through an error path while asynchronous strip-decompression work remains queued. Because task_set is declared before ok and compressed_scratch, those captured objects are destroyed before the task-set destructor waits, allowing worker tasks to use stale stack and heap storage, resulting in a use-after-scope crash and denial of service. The affected implementation is identified by src/tiff.imageio/tiffinput.cpp, TIFFInput::read_native_scanlines(), task_set, ok, compressed_scratch, and uncompress_one_strip(), which define the relevant source path, functions, state, and trigger. This issue is fixed in 3.1.16.0.
Weakness: CWE-825
Which versions are affected by CVE-2026-65970?
It affects 1 product.
Products include Openimageio Openimageio.
How do I fix CVE-2026-65970?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-65970 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-65970 exists.
Other vulnerabilities in Openimageio Openimageio
Sources
Also known as GHSA-v278-gpwr-r836, UBUNTU-CVE-2026-65970.