AcademySoftwareFoundation OpenEXR up to 3.1.13/3.2.6/3.3.8/3.4.8 EXR File Parser internal_exr_undo_piz out-of-bounds

Summaryinfo

A vulnerability has been found in AcademySoftwareFoundation OpenEXR up to 3.1.13/3.2.6/3.3.8/3.4.8 and classified as problematic. This affects the function internal_exr_undo_piz of the component EXR File Parser. This manipulation causes out-of-bounds. This vulnerability is handled as CVE-2026-34588. It is possible to launch the attack on the local host. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenEXR up to 3.1.13/3.2.6/3.3.8/3.4.8. It has been declared as problematic. Affected by this vulnerability is the function internal_exr_undo_piz of the component EXR File Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect 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 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34588 since 03/30/2026. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 305103 (Linux Distros Unpatched Vulnerability : CVE-2026-34588), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.2.7, 3.3.9 or 3.4.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (305103). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenEXR

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 3.1.9
• 3.1.10
• 3.1.11
• 3.1.12
• 3.1.13
• 3.2.0
• 3.2.1
• 3.2.2
• 3.2.3
• 3.2.4
• 3.2.5
• 3.2.6
• 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
• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 3.4.4
• 3.4.5
• 3.4.6
• 3.4.7
• 3.4.8

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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