Integer overflow in OpenEXR - CVE-2026-55373
Published: June 23, 2026
Vulnerability identifier: #VU135033
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-55373
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: OpenEXR
Affected software:
OpenEXR
OpenEXR
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow or wraparound in roundListSizeUp() in OpenEXRUtil SampleCountChannel when processing a sample count of UINT_MAX. A remote attacker can supply a UINT_MAX sample count through the public API to cause a denial of service.
The issue results in an infinite CPU loop in both the endEdit() path and the direct set(x, y, UINT_MAX) path.
How to mitigate CVE-2026-55373
Install security update from vendor's website.