# CVE-2026-67549: OpenImageIO heap overflow in TIFF CMYK decoding

Source: https://junglewise.ai/threats/cve-2026-67549-openimageio-is-a-toolset-for-reading-writing-and-manipulating  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-67549 · Severity: high · CVSS 7.6 · Published 2026-09-18

OpenImageIO is an image processing library used in visual effects and animation workflows. A heap overflow vulnerability in TIFF file parsing allows attackers to crash the application or potentially execute arbitrary code by providing a specially crafted 1-bit CMYK TIFF file that triggers an out-of-bounds memory write during image decoding.

Technologies: [Academy Software Foundation OpenImageIO](https://junglewise.ai/threats/technologies/openimageio). Vendors: [Academy Software Foundation](https://junglewise.ai/threats/vendors/academy-software-foundation).

## Quick answers

**Is CVE-2026-67549 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-67549 being exploited in the wild.

**How severe is CVE-2026-67549?** High severity, with a CVSS score of 7.6, published 18 September 2026.

**Which products and versions are affected?** Academy Software Foundation OpenImageIO prior to 3.1.16.0.

**Is there a fix for CVE-2026-67549?** A patch was published on 2026-07-04: Fix merged in commit 6e9b86e Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-67549 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-67549?** Check whether you run Academy Software Foundation OpenImageIO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap buffer overflow exists in TIFFInput::read_native_scanline_locked() when processing 1-bit contiguous CMYK TIFF files with PHOTOMETRIC_SEPARATED color space. The vulnerability occurs because bit_convert() writes 8-bit expanded values to a smaller bit-packed buffer, causing out-of-bounds writes and heap corruption. The issue requires no authentication or user interaction beyond opening a malicious TIFF file; it is fixed in version 3.1.16.0.

## Affected products

- Academy Software Foundation OpenImageIO prior to 3.1.16.0

## Timeline

- 2026-07-04: patched: Fix merged in commit 6e9b86e
- 2026-09-18: disclosed

## References

- [https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/6e9b86ee4cce8fd7bed6cfb101a266d8f8a296d4](https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/6e9b86ee4cce8fd7bed6cfb101a266d8f8a296d4)
- [https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5296](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5296)

## Related threats

- [OpenImageIO integer overflow in Cineon codec scanline buffer](https://junglewise.ai/threats/cve-2026-113681-openimageio-before-3-0-20-0-3-1-x-before-3-1-15-0-and-3-2-x)
- [OpenImageIO use-after-scope in multithreaded TIFF decompression](https://junglewise.ai/threats/cve-2026-65970-openimageio-is-a-toolset-for-reading-writing-and-manipulating)
- [OpenImageIO integer overflow in GIF palette splitting](https://junglewise.ai/threats/cve-2026-65969-openimageio-is-a-toolset-for-reading-writing-and-manipulating)
- [OpenImageIO heap overflow in cineon image parsing](https://junglewise.ai/threats/cve-2026-63638-openimageio-is-a-toolset-for-reading-writing-and-manipulating)
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