Out-of-bounds write in Openimageio - CVE-2026-108386
Published: November 9, 2026
Vulnerability identifier: #VU163070
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-108386
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated attacker to crash applications that process attacker-supplied TIFF files through OpenImageIO's ImageCache or TextureSystem.
The vulnerability exists due to inconsistent TIFF reader state after a directory fails validation, causing ImageCache to allocate storage using dimensions that differ from those used for copying pixels. An unauthenticated attacker can supply a crafted multi-directory TIFF for a victim to process, triggering an oversized write of attacker-controlled pixel data into a smaller heap buffer.
Affected software
Openimageio
How to mitigate CVE-2026-108386
Install security update from vendor's website.
Openimageio - update to 3.1.18.0