AcademySoftwareFoundation OpenImageIO up to 3.1.15.9 TIFF Input tiffinput.cpp TIFFInput::bit_convert out-of-bounds write

Summaryinfo

A vulnerability classified as critical was found in AcademySoftwareFoundation OpenImageIO. Affected is the function TIFFInput::bit_convert of the file src/tiff.imageio/tiffinput.cpp of the component TIFF Input. Such manipulation leads to out-of-bounds write. This vulnerability is uniquely identified as CVE-2026-67549. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenImageIO. It has been rated as critical. Affected by this issue is the function TIFFInput::bit_convert of the file src/tiff.imageio/tiffinput.cpp of the component TIFF Input. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 1-bit contiguous cmyk tiff is exposed through a native uint1 imagespec, so callers allocate a bit-packed buffer. tiffinput::read_native_scanline_locked() nevertheless invokes tiffinput::bit_convert() with 8-bit output and writes one expanded byte per value into that smaller buffer, resulting in a heap out-of-bounds write and memory corruption. The affected implementation is identified by src/tiff.imageio/tiffinput.cpp, TIFFInput::bit_convert(), TIFFInput::read_native_scanline_locked(), PHOTOMETRIC_SEPARATED, 1-bit CMYK, and native uint1 ImageSpec, which define the relevant source path, functions, state, and trigger. This issue is fixed in 3.1.16.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-67549 since 07/29/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

Upgrading to version 3.1.16.0 eliminates this vulnerability.

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Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenImageIO

Version

• 2.5.13.1
• 3.0.16.0
• 3.0.18.0
• 3.0.20.0
• 3.0.21.0
• 3.1.11.0
• 3.1.13.0
• 3.1.15.0
• 3.1.15.9

License

• open-source

Website

• Product: https://github.com/AcademySoftwareFoundation/OpenImageIO/

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