Vulnerability Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openexr | Openexr | >= 3.4.0, < 3.4.7 |
Related Weaknesses (CWE)
References
- https://github.com/AcademySoftwareFoundation/openexr/commit/3827998f5c041d6a94c6Patch
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.7ProductRelease Notes
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-ghExploitVendor Advisory
FAQ
What is CVE-2026-34545?
CVE-2026-34545 is a vulnerability with a CVSS score of 7.3 (HIGH). OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.7, an attacker...
How severe is CVE-2026-34545?
CVE-2026-34545 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34545?
Check the references section above for vendor advisories and patch information. Affected products include: Openexr Openexr.