Vulnerability Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openexr | Openexr | >= 3.4.0, < 3.4.9 |
Related Weaknesses (CWE)
References
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9ProductRelease Notes
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v7ExploitVendor Advisory
FAQ
What is CVE-2026-34378?
CVE-2026-34378 is a vulnerability with a CVSS score of 6.5 (MEDIUM). OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.4.0 to before 3.4.9, a missing bounds check on t...
How severe is CVE-2026-34378?
CVE-2026-34378 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34378?
Check the references section above for vendor advisories and patch information. Affected products include: Openexr Openexr.