What’s Vulnerable › Vulnerabilities
CVE-2026-34589: OpenEXR: DWA Lossy Decoder Heap Out-of-Bounds Write
- Severity: medium (CVSS 5.0 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-04-06 · updated 2026-10-26
- Weakness: CWE-190
Description
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
Affected products
- AcademySoftwareFoundation openexr: from 3.2.0 before 3.2.7; from 3.3.0 before 3.3.9; from 3.4.0 before 3.4.9 — fixed in 3.2.7, 3.3.9, 3.4.9
How to fix
Upgrade to a fixed version: AcademySoftwareFoundation openexr 3.2.7, 3.3.9, 3.4.9. Check the vendor advisory for mitigations.
References
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9
- https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-p8xc-w3q4-h64x
- https://access.redhat.com/security/cve/CVE-2026-34589
- https://bugzilla.redhat.com/show_bug.cgi?id=2455411
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34589.json
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