Medium [CVE-2026-55371] Denial of Service via NULL pointer dereference in exr_attr_set_bytes
This medium-severity Red Hat Linux advisory covers CVE-2026-55371.
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Summary
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. A flaw was found in OpenEXR.
This can lead to a deterministic crash, resulting in a denial of service (DoS), which makes the affected system or application unavailable. This vulnerability only affects OpenEXR versions 3.4.0 through 3.4.12.
No Red Hat products or Fedora community distributions ship a version within this range. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-476.
- 3.4.0
- 3.4.12
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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