Use of uninitialized resource in OpenEXR - CVE-2026-34543
Published: April 8, 2026
Vulnerability identifier: #VU125326
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34543
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to use of uninitialized resource in undo_pxr24_impl and exr_uncompress_buffer when parsing a crafted PXR24 EXR file with a truncated zlib stream. A remote attacker can supply a specially crafted EXR file to disclose sensitive information.
The issue is triggered during decoding under default settings.
Affected software
OpenEXR
Anolis OS
Fedora
mingw-openexr
OpenEXR
OpenEXR-devel
OpenEXR-libs
OpenEXR-doc
Anolis OS
Fedora
mingw-openexr
OpenEXR
OpenEXR-devel
OpenEXR-libs
OpenEXR-doc
How to mitigate CVE-2026-34543
Install security update from vendor's website.
OpenEXR - addressed in versions 3.2.7, 3.3.9, 3.4.8
mingw-openexr - addressed in versions 3.4.8-1.fc44, 3.4.9-1.fc44
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
mingw-openexr - addressed in versions 3.4.8-1.fc44, 3.4.9-1.fc44
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