AcademySoftwareFoundation OpenEXR up to 3.4.6 EXR File Parser heap-based overflow

Summaryinfo

A vulnerability labeled as critical has been found in AcademySoftwareFoundation OpenEXR up to 3.4.6. This issue affects some unknown processing of the component EXR File Parser. The manipulation results in heap-based overflow. This vulnerability was named CVE-2026-34545. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in AcademySoftwareFoundation OpenEXR up to 3.4.6. Affected is an unknown part of the component EXR File Parser. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-34545 since 03/30/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 3.4.7 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 3827998f5c041d6a94c6af24bbb363daa669e4b3 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenEXR

Version

• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6

License

• open-source

Website

• Product: https://github.com/AcademySoftwareFoundation/openexr/

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