Vulnerability Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openexr | Openexr | >= 3.1.0, < 3.2.7 |
Related Weaknesses (CWE)
References
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7ProductRelease Notes
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9ProductRelease Notes
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9ProductRelease Notes
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-58ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-34588?
CVE-2026-34588 is a vulnerability with a CVSS score of 7.8 (HIGH). OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_...
How severe is CVE-2026-34588?
CVE-2026-34588 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34588?
Check the references section above for vendor advisories and patch information. Affected products include: Openexr Openexr.