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CVE-2026-34545

7.3 · HIGH

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

Published Apr 1, 2026CWE-122EPSS 0.74%

Overview

CVE-2026-34545 is a high-severity vulnerability. It was published on April 1, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, 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 version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7.

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/commit/3827998f5c041d6a94c6af24bbb363daa669e4b3GitHubgithub.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.7GitHubgithub.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-ghfj-fx47-wg97Refaccess.redhat.com/security/cve/CVE-2026-34545Refbugzilla.redhat.com/show_bug.cgi?id=2454139Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34545.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34545?

CVE-2026-34545 is a high-severity vulnerability. It was published on April 1, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-34545?

This vulnerability has a CVSS 3.1 base score of 7.3, 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-2026-34545?

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-2026-34545?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34545 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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