Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-67549

CVE-2026-67549HIGH

AcademySoftwareFoundation OpenImageIO — OpenImageIO: TIFF 1-bit CMYK bit conversion heap out-of-bounds write

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  U  L  L  H    7.6   .0029   19.4     —

AFFECTED
  Product      Versions      Fixed
  OpenImageIO  < 3.1.16.0 –  —

TIMELINE
  Jul 29  Reserved by GitHub_M
  Sep 18  Published (CNA: GitHub_M)
  Sep 24  EXPLOIT PUBLISHED — CVE-2026-67549 (AcademySoftwareFoundation OpenImageIO). Public exploit reference added.
  Sep 29  EXPLOIT PUBLISHED — CVE-2026-67549 (AcademySoftwareFoundation OpenImageIO). Public exploit reference added.

CWE-122, CWE-131, CWE-787 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

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 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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
July 29, 2026	Reserved	Reserved by GitHub_M
September 18, 2026	Published	Published (CNA: GitHub_M)
September 24, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67549 (AcademySoftwareFoundation OpenImageIO). Public exploit reference added.
September 29, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-67549 (AcademySoftwareFoundation OpenImageIO). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
AcademySoftwareFoundation	OpenImageIO	—	< 3.1.16.0	—

Weaknesses

CWE-122 · CWE-131 · CWE-787

References (5)

https://github.com/AcademySoftwareFoundation/OpenImageIO/commit/6e9b86ee4cce8fd7bed6cfb101a266d8f8a296d4 [Patch]
https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5296 [Issue Tracking, Patch]
https://github.com/AcademySoftwareFoundation/OpenImageIO/releases/tag/v3.1.16.0 [Release Notes]
https://github.com/AcademySoftwareFoundation/OpenImageIO/security/advisories/GHSA-3wxw-rqhw-j2w4 [Exploit, Vendor Advisory]
https://github.com/user-attachments/files/29615314/poc.zip [Exploit]

Authoritative record: CVE-2026-67549 at cve.org

Vendors: academysoftwarefoundation

Weaknesses: CWE-122 · CWE-131 · CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-67549 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.