Integer overflow in OpenEXR - CVE-2026-34380

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Main Vulnerability Database Vulnerabilities #VU125331

Integer overflow in OpenEXR - CVE-2026-34380

Published: April 8, 2026


Vulnerability identifier: #VU125331
CSH Severity: Medium
CVSS v4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-34380
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service and modify memory.

The vulnerability exists due to integer overflow or wraparound in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c when parsing a crafted PXR24-compressed EXR file. A remote attacker can supply a specially crafted EXR file to cause a denial of service and modify memory.

User interaction is required to open or process the crafted file, and exploitation requires a FLOAT channel using PXR24 compression.


Affected software

OpenEXR
Ubuntu
openEuler
Anolis OS
Fedora
openexr (Ubuntu package)
OpenEXR
OpenEXR-debuginfo
OpenEXR-debugsource
OpenEXR-devel
OpenEXR-libs
mingw-openexr
OpenEXR-doc
usd

How to mitigate CVE-2026-34380

Install security update from vendor's website.

OpenEXR - addressed in versions 3.2.7, 3.3.9, 3.4.9
openexr (Ubuntu package) - addressed in versions 2.2.0-10ubuntu2.6+esm4, 2.2.0-11.1ubuntu1.9+esm1, 2.3.0-6ubuntu0.5+esm2, 2.5.7-1ubuntu0.1~esm2, 3.1.5-5.1ubuntu0.1~esm1, 3.1.13-2ubuntu0.26.04.1~esm1
OpenEXR - addressed in versions 3.1.5-6, 3.1.11-7
OpenEXR-debuginfo - addressed in versions 3.1.5-6, 3.1.11-7
OpenEXR-debugsource - addressed in versions 3.1.5-6, 3.1.11-7
OpenEXR-devel - addressed in versions 3.1.5-6, 3.1.11-7
OpenEXR-libs - addressed in versions 3.1.5-6, 3.1.11-7
mingw-openexr - addressed in versions 3.3.9-1.fc42, 3.3.9-1.fc43
OpenEXR-doc - update to 3.4.4-6
OpenEXR-libs - update to 3.4.4-6
OpenEXR-devel - update to 3.4.4-6
OpenEXR - update to 3.4.4-6
usd - addressed in versions 25.08-20.fc43, 26.03-3.fc44, 26.03-3.fc45

External References

Related Security Bulletins