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CVE-2026-34588

7.8 · HIGH

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry.

Published Apr 6, 2026CWE-125EPSS 0.57%

Overview

CVE-2026-34588 is a high-severity vulnerability. It was published on April 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7GitHubgithub.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9GitHubgithub.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9GitHubgithub.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-588r-cr5c-w6hfRefaccess.redhat.com/errata/RHSA-2026:15887Refaccess.redhat.com/errata/RHSA-2026:15888Refaccess.redhat.com/errata/RHSA-2026:17656Refaccess.redhat.com/errata/RHSA-2026:17658Refaccess.redhat.com/errata/RHSA-2026:17659Refaccess.redhat.com/errata/RHSA-2026:17660

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34588?

CVE-2026-34588 is a high-severity vulnerability. It was published on April 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-34588?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-34588?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34588?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34588 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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