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
A flaw was found in OpenEXR. A vulnerability in the `exr_attr_set_bytes()` function allows an attacker to trigger a NULL pointer dereference by providing a positive `hint_length` with a NULL `type_hint`.
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. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour 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 1 hour ago·verify at source
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