AcademySoftwareFoundation OpenEXR up to 3.4.7 EXR File Parser exr_decoding_run integer overflow

Summaryinfo

A vulnerability, which was classified as critical, has been found in AcademySoftwareFoundation OpenEXR up to 3.4.7. This impacts the function exr_decoding_run of the component EXR File Parser. The manipulation leads to integer overflow. This vulnerability is listed as CVE-2026-34544. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenEXR up to 3.4.7 and classified as critical. This issue affects the function exr_decoding_run of the component EXR File Parser. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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 3.4.8, a crafted B44 or B44A EXR file can cause an out-of-bounds write in any application that decodes it via exr_decoding_run(). Consequences range from immediate crash (most likely) to corruption of adjacent heap allocations (layout-dependent). This issue has been patched in version 3.4.8.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-34544 since 03/30/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.4.8 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 35e7aa35e22c1975606be86e859f31cc1fc598ee 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
• 3.4.7

License

• open-source

Website

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

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