What’s Vulnerable › Vulnerabilities

CVE-2026-34544: OpenEXR: integer overflow to OOB write in uncompress_b44_impl()

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-01 · 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 version 3.4.0 to before version 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.

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 3.4.8 — fixed in 3.2.7, 3.3.9, 3.4.8

How to fix

Upgrade to a fixed version: AcademySoftwareFoundation openexr 3.2.7, 3.3.9, 3.4.8. Check the vendor advisory for mitigations.

References

• https://github.com/AcademySoftwareFoundation/openexr/commit/35e7aa35e22c1975606be86e859f31cc1fc598ee
• https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.8
• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-h762-rhv3-h25v

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