What’s Vulnerable › Vulnerabilities

CVE-2025-64181: OpenEXR Makes Use of Uninitialized Memory

• Severity: high (CVSS 7.5 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: 2025-11-10 · updated 2026-06-17
• Weakness: CWE-457

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.3.0 through 3.3.5 and 3.4.0 through 3.4.2, while fuzzing `openexr_exrcheck_fuzzer`, Valgrind reports a conditional branch depending on uninitialized data inside `generic_unpack`. This indicates a use of uninitialized memory. The issue can result in undefined behavior and/or a potential crash/denial of service. Versions 3.3.6 and 3.4.3 fix the issue.

Affected products

• AcademySoftwareFoundation openexr: from 3.3.0 before 3.3.6; from 3.4.0 before 3.4.3 — fixed in 3.3.6, 3.4.3

How to fix

Upgrade to a fixed version: AcademySoftwareFoundation openexr 3.3.6, 3.4.3. Check the vendor advisory for mitigations.

References

• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq
• https://github.com/user-attachments/files/23024726/archive0.zip
• https://github.com/user-attachments/files/23024736/archive1.zip
• https://github.com/user-attachments/files/23024740/archive2.zip
• https://github.com/user-attachments/files/23024744/archive3.zip
• https://github.com/user-attachments/files/23024746/archive4.zip
• https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq

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