Medium [CVE-2026-55059] Heap out-of-bounds write leads to denial of service
This medium-severity Red Hat Linux advisory covers CVE-2026-55059 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in OpenEXR, a widely used library for the EXR image format. A user processing a specially crafted image file could trigger a heap out-of-bounds write vulnerability in the `SampleCountChannel::set` function.
This occurs due to an incorrect computation of the target Y coordinate, leading to writes before an allocated buffer. Successful exploitation can result in heap corruption and process crashes, potentially causing a denial of service.
This flaw affects the SampleCountChannel component of OpenEXR, which was introduced in version 2.0. Red Hat Enterprise Linux 6 and 7 ship OpenEXR 1.x, which does not include this component and is not affected.
Other Red Hat products shipping OpenEXR 2.x and later are affected. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).
Weakness: CWE-124. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat package: openexr.
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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