CVE-2026-55371: Academysoftwarefoundation Openexr

Medium severity, CVSS 6.9. EPSS: 0.2% chance of exploitation in the next 30 days.

OpenEXR is the reference implementation and specification for the EXR high-dynamic-range image file format, widely used in the motion picture industry. Versions 3.4.0 through 3.4.12 contain a NULL pointer dereference in the OpenEXRCore function exr_attr_set_bytes(). The public setter validates the top-level exr_attr_bytes_t value pointer but does not verify that the nested type_hint pointer is non-NULL when hint_length is greater than zero. When a caller supplies a positive hint_length together with a NULL type_hint, exr_attr_bytes_create() allocates a destination type-hint buffer and then copies from the NULL source pointer, causing a deterministic crash. The flaw is reachable through the public OpenEXRCore C API and results in a denial of service. The issue is fixed in version 3.4.13.

Affected products

• Academysoftwarefoundation Openexr: from 3.4.0, before 3.4.13 (fixed in 3.4.13)

Published 2026-08-25. Last modified 2026-09-09.