CVE-2026-34589
MediumCVSS 5.0Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
In OpenEXR versions 3.2.0 to 3.2.7, 3.3.9, and 3.4.9, a vulnerability exists in the DWA lossy decoder. For sufficiently large image widths, 32-bit arithmetic overflow causes writes outside the allocated rowBlock buffer.
Risk Assessment
An attacker could exploit this vulnerability to achieve remote code execution or cause a denial of service in applications processing EXR images, posing a risk to systems using this library.
Recommendation
Immediately update OpenEXR to version 3.2.7, 3.3.9, or 3.4.9, depending on the branch in use.
Original NVD description (English source)
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.