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Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M

CVE-2026-59156OpenImageIO: Unbounded recursion in FITS header parser leads to stack overflow

Medium 6.5

In plain English

A medium-severity security flaw in OpenImageIO from AcademySoftwareFoundation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 69.7% 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 fits stream containing consecutive 2880-byte header blocks without the mandatory end keyword makes fitsinput::read_fits_header() call itself without a depth bound. repeated recursive parsing exhausts the application stack, resulting in denial of service. The affected implementation is identified by src/fits.imageio/fitsinput.cpp, FitsInput::read_fits_header(), END keyword, and 2880-byte FITS header blocks, 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-2026-59156
Debian:13openimageiono fix listedDEBIAN-CVE-2026-59156
Debian:14openimageio3.1.18.0+dfsg-2DEBIAN-CVE-2026-59156
Ubuntu:22.04:LTSopenimageiono fix listedUBUNTU-CVE-2026-59156
Ubuntu:26.10openimageiono fix listedUBUNTU-CVE-2026-59156

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-674 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References