CVE-2026-67549
OpenImageIO: TIFF 1-bit CMYK bit conversion heap out-of-bounds write
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.
- Affected
- AcademySoftwareFoundation · OpenImageIO
- CVSS v3.1 GITHUB
- 7.6 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H - EPSS
- 0.29% chance of exploitation in the next 30 days, 20th percentile
- Published
- 2026-09-18
- Updated
- 2026-09-24
Proof-of-concept exploits (1)
Security advisories
- AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-3wxw-rqhw-j2w4
- AcademySoftwareFoundation/OpenImageIO/pull/5296