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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-59181OpenImageIO: Stack buffer overflow in OpenImageIO Cineon reader via unchecked numberOfElements

Medium 6.1

In plain English

A medium-severity stack buffer overflow in OpenImageIO from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 89.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1, A crafted cineon file can supply a numberofelements value greater than the format maximum of eight. cineoninput::open() uses that unchecked value as the loop bound while filling the fixed strings[8] array, writing pointers beyond the stack buffer and into adjacent state, resulting in memory corruption and denial of service. The affected implementation is identified by src/cineon.imageio/cineoninput.cpp, CineonInput::open(), numberOfElements, and strings[8], which define the relevant source path, functions, state, and trigger. This issue is fixed in versions 3.0.20.0, 3.1.15.0, and 3.2.0.3-beta1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12openimageiono fix listedDEBIAN-CVE-2026-59181
Debian:13openimageiono fix listedDEBIAN-CVE-2026-59181
Debian:14openimageio3.1.18.0+dfsg-2DEBIAN-CVE-2026-59181
Ubuntu:22.04:LTSopenimageiono fix listedUBUNTU-CVE-2026-59181
Ubuntu:26.10openimageiono fix listedUBUNTU-CVE-2026-59181

Affected products (as reported)

VendorProductVersions
AcademySoftwareFoundation OpenImageIO < 3.0.20.0>= 3.1.0.0, < 3.1.15.0>= 3.2.0.0-dev, < 3.2.0.3-beta1

Weakness: CWE-121, CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H

References