CVE-2026-55059

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.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

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.