AcademySoftwareFoundation OpenEXR up to 3.2.8/3.3.10/3.4.10 EXR File readVariableLengthInteger integer overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in AcademySoftwareFoundation OpenEXR up to 3.2.8/3.3.10/3.4.10. This vulnerability affects the function readVariableLengthInteger of the component EXR File Handler. Executing a manipulation can lead to integer overflow. The identification of this vulnerability is CVE-2026-42217. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in AcademySoftwareFoundation OpenEXR up to 3.2.8/3.3.10/3.4.10 and classified as critical. This vulnerability affects the function readVariableLengthInteger of the component EXR File Handler. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect 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 versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger() decodes a variable-length integer from untrusted EXR input without bounding the shift count. After enough continuation bytes, the code executes a left shift by 70 on a 64-bit value, which is undefined behavior. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-42217 since 04/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 313069 (Linux Distros Unpatched Vulnerability : CVE-2026-42217), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.2.9, 3.3.11 or 3.4.11 eliminates this vulnerability. Applying the patch 21eaa33bcbbb0c83a5fc42f6b6d65b70a996e63c 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.

The vulnerability is also documented in the databases at Tenable (313069) and EUVD (EUVD-2026-28300). Once again VulDB remains the best source for 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
• 3.2.8
• 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
• 3.3.10
• 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
• 3.4.10

License

• open-source

Website

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

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Once again VulDB remains the best source for vulnerability data.

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