Integer overflow in OpenEXR - CVE-2026-34378

Vulnerability identifier: #VU125333

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-34378

CWE-ID: CWE-190

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to integer overflow in generic_unpack() when parsing crafted EXR files with a negative dataWindow.min.x value. A remote attacker can supply a specially crafted EXR file to cause a denial of service.

User interaction is required to open or process the crafted EXR file.

OpenEXR
Anolis OS
Fedora
OpenEXR
OpenEXR-devel
OpenEXR-libs
OpenEXR-doc
usd

Install security update from vendor's website.

OpenEXR - update to 3.4.9
OpenEXR - addressed in versions 3.4.4-5, 3.4.11-2
OpenEXR-devel - addressed in versions 3.4.4-5, 3.4.11-2
OpenEXR-libs - addressed in versions 3.4.4-5, 3.4.11-2
OpenEXR-doc - addressed in versions 3.4.4-5, 3.4.11-2
usd - addressed in versions 25.08-20.fc43, 26.03-3.fc44, 26.03-3.fc45

• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v76p-4qvv-vh4g
• https://github.com/advisories/GHSA-v76p-4qvv-vh4g

• Multiple vulnerabilities in OpenEXR
• Fedora 45 update for usd
• Fedora 44 update for usd
• Fedora 43 update for usd
• Anolis OS update for OpenEXR
• Anolis OS update for OpenEXR