CVE-2026-43905: OpenImageIO: JPEG2000 (OpenJPH) signed integer overflow in buffer allocation

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-14 · updated 2026-10-26
Weakness: CWE-190

Description

OpenImageIO is a toolset for reading, writing, and manipulating image files of any image file format relevant to VFX / animation. Prior to 3.0.18.0 and 3.1.13.0, jpeg2000input.cpp:395 computes buffer size as const int bufsize = w * h * ch * buffer_bpp using signed 32-bit arithmetic. When the product exceeds INT_MAX, the result wraps to 0 or a small value. m_buf.resize() allocates an undersized buffer, and subsequent pixel write loops cause heap overflow. Conditional on USE_OPENJPH build flag. This vulnerability is fixed in 3.0.18.0 and 3.1.13.0.

Affected products

OpenImageIO Project OpenImageIO: before 3.0.18.0; from 3.1.4.0 before 3.1.13.0 — fixed in 3.0.18.0, 3.1.13.0

How to fix

Upgrade to a fixed version: OpenImageIO Project OpenImageIO 3.0.18.0, 3.1.13.0. Check the vendor advisory for mitigations.

References

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