AcademySoftwareFoundation OpenEXR up to 3.3.12/3.4.13 PyPart PyPart::setDeepSliceData heap-based overflow

Summaryinfo

A vulnerability described as problematic has been identified in AcademySoftwareFoundation OpenEXR up to 3.3.12/3.4.13. The impacted element is the function PyPart::setDeepSliceData of the component PyPart. Such manipulation leads to heap-based overflow. This vulnerability is traded as CVE-2026-62986. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenEXR up to 3.3.12/3.4.13 and classified as problematic. Affected by this issue is the function PyPart::setDeepSliceData of the component PyPart. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is confidentiality. CVE summarizes:

OpenEXR is the reference implementation and specification for the EXR image file format, widely used in the motion picture industry. In versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13, the PyOpenEXR Python bindings return stale heap data when reading a crafted deep scanline EXR that uses layer-prefixed RGB channels. With the default channel coalescing (separate_channels=False), the wrapper groups channels such as left.R, left.G, and left.B into a single RGB sample array, but the lane-offset calculation in PyPart::setDeepSliceData() only recognizes the exact unprefixed names G, B, and A. As a result, prefixed channels like left.G and left.B are decoded into lane 0 while lanes 1 and 2 are left uninitialized and returned to Python. A Python application that reads untrusted deep EXR files through the default OpenEXR.File API and then logs, serializes, previews, or otherwise processes the resulting NumPy sample arrays may expose uninitialized same-process heap contents, in addition to receiving incorrect green and blue channel data. This issue is fixed in versions 3.3.13 and 3.4.14.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-62986 since 07/15/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 3.3.13 or 3.4.14 eliminates this vulnerability.

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Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenEXR

Version

• 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
• 3.3.11
• 3.3.12
• 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
• 3.4.11
• 3.4.12
• 3.4.13

License

• open-source

Website

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

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