AcademySoftwareFoundation OpenEXR up to 3.2.4/3.3.5/3.4.2 EXR File Parser pyOpenEXR_old.cpp PyObject_StealAttrString use after free

Summaryinfo

A vulnerability classified as critical was found in AcademySoftwareFoundation OpenEXR up to 3.2.4/3.3.5/3.4.2. The impacted element is the function PyObject_StealAttrString of the file pyOpenEXR_old.cpp of the component EXR File Parser. The manipulation results in use after free. This vulnerability is known as CVE-2025-64183. Attacking locally is a requirement. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenEXR up to 3.2.4/3.3.5/3.4.2. It has been classified as problematic. Affected is the function PyObject_StealAttrString of the file pyOpenEXR_old.cpp of the component EXR File Parser. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on availability. CVE summarizes:

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In versions 3.2.0 through 3.2.4, 3.3.0 through 3.3.5, and 3.4.0 through 3.4.2, there is a use-after-free in PyObject_StealAttrString of pyOpenEXR_old.cpp. The legacy adapter defines PyObject_StealAttrString that calls PyObject_GetAttrString to obtain a new reference, immediately decrefs it, and returns the pointer. Callers then pass this dangling pointer to APIs like PyLong_AsLong/PyFloat_AsDouble, resulting in a use-after-free. This is invoked in multiple places (e.g., reading PixelType.v, Box2i, V2f, etc.) Versions 3.2.5, 3.3.6, and 3.4.3 fix the issue.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2025-64183 since 10/28/2025. The exploitability is told to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 274727 (Linux Distros Unpatched Vulnerability : CVE-2025-64183), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.2.5, 3.3.6 or 3.4.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (274727). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenEXR

Version

• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.2.4
• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.4.0
• 3.4.1
• 3.4.2

License

• open-source

Website

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

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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