Heap-based buffer overflow in OpenEXR - CVE-2026-34545
Published: April 8, 2026
Vulnerability identifier: #VU125328
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34545
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to heap-based buffer overflow in the HTJ2K decoder in internal_ht.cpp when parsing a crafted EXR file with HTJ2K compression. A remote attacker can supply a specially crafted EXR file to execute arbitrary code.
User interaction is required to open or otherwise process the crafted file.
Affected software
OpenEXR
Anolis OS
OpenEXR
OpenEXR-devel
OpenEXR-libs
OpenEXR-doc
Anolis OS
OpenEXR
OpenEXR-devel
OpenEXR-libs
OpenEXR-doc
How to mitigate CVE-2026-34545
Install security update from vendor's website.
OpenEXR - update to 3.4.7
OpenEXR - update to 3.4.10-1
OpenEXR-devel - update to 3.4.10-1
OpenEXR-libs - update to 3.4.10-1
OpenEXR-doc - update to 3.4.10-1
OpenEXR - update to 3.4.10-1
OpenEXR-devel - update to 3.4.10-1
OpenEXR-libs - update to 3.4.10-1
OpenEXR-doc - update to 3.4.10-1