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

April 6, 2026

While fuzzing openexr_exrcheck_fuzzer, Valgrind reports a conditional branch depending on uninitialized data inside generic_unpack. This indicates a use of uninitialized memory (CWE-457). The issue is reproducible with the current OSS-Fuzz harness and a single-file PoC.

References

  • github.com/AcademySoftwareFoundation/openexr
  • github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq
  • github.com/advisories/GHSA-3h9h-qfvw-98hq
  • github.com/user-attachments/files/23024726/archive0.zip
  • github.com/user-attachments/files/23024736/archive1.zip
  • github.com/user-attachments/files/23024740/archive2.zip
  • github.com/user-attachments/files/23024744/archive3.zip
  • github.com/user-attachments/files/23024746/archive4.zip
  • nvd.nist.gov/vuln/detail/CVE-2025-64181

Code Behaviors & Features

Detect and mitigate CVE-2025-64181 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions starting from 3.3.0 before 3.3.6, all versions starting from 3.4.0 before 3.4.3

Fixed versions

  • 3.3.6
  • 3.4.3

Solution

Upgrade to versions 3.3.6, 3.4.3 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-457: Use of Uninitialized Variable

Source file

pypi/OpenEXR/CVE-2025-64181.yml

Spotted a mistake? Edit the file on GitLab.

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