Improper locking in OpenEXR - #VU135031
Published: June 23, 2026
Vulnerability identifier: #VU135031
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: N/A
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: OpenEXR
Affected software:
OpenEXR
OpenEXR
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper locking in exr_get_chunk_table_offset() when handling write contexts before the header has been written. A local user can call the public OpenEXRCore C API in a sequence that leaves the context locked to cause a denial of service.
A later API call that attempts to acquire the same lock can block forever, resulting in a deterministic self-deadlock and process hang.
Remediation
Install security update from vendor's website.