AcademySoftwareFoundation OpenEXR up to 3.2.7/3.3.9/3.4.9 EXR File internal_dwa_compressor.h integer overflow

Summaryinfo

A vulnerability classified as critical has been found in AcademySoftwareFoundation OpenEXR up to 3.2.7/3.3.9/3.4.9. Impacted is an unknown function of the file internal_dwa_compressor.h of the component EXR File Handler. The manipulation leads to integer overflow. This vulnerability is referenced as CVE-2026-40250. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenEXR up to 3.2.7/3.3.9/3.4.9 and classified as critical. This issue affects some unknown processing of the file internal_dwa_compressor.h of the component EXR File Handler. 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. In versions 3.4.0 through 3.4.9, 3.3.0 through 3.3.9, and 3.2.0 through 3.2.7, `internal_dwa_compressor.h:1040` performs `chan->width * chan->bytes_per_element` in `int32` arithmetic without a `(size_t)` cast. This is the same overflow pattern fixed in other decoders by CVE-2026-34589/34588/34544, but this line was missed. Versions 3.4.10, 3.3.10, and 3.2.8 contain a fix that addresses `internal_dwa_compressor.h:1040`.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-40250 since 04/10/2026. 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 are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 309647 (Linux Distros Unpatched Vulnerability : CVE-2026-40250), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.2.8, 3.3.10 or 3.4.10 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (309647). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenEXR

Version

• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.2.4
• 3.2.5
• 3.2.6
• 3.2.7
• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.3.6
• 3.3.7
• 3.3.8
• 3.3.9
• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6
• 3.4.7
• 3.4.8
• 3.4.9

License

• open-source

Website

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

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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