AcademySoftwareFoundation OpenEXR up to 3.4.8 EXR File Parser generic_unpack integer overflow

Summaryinfo

A vulnerability marked as problematic has been reported in AcademySoftwareFoundation OpenEXR up to 3.4.8. Affected is the function generic_unpack of the component EXR File Parser. The manipulation leads to integer overflow. This vulnerability is documented as CVE-2026-34378. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in AcademySoftwareFoundation OpenEXR up to 3.4.8 and classified as problematic. This issue affects the function generic_unpack of the component EXR File Parser. 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 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 3.4.0 to before 3.4.9, a missing bounds check on the dataWindow attribute in EXR file headers allows an attacker to trigger a signed integer overflow in generic_unpack(). By setting dataWindow.min.x to a large negative value, OpenEXRCore computes an enormous image width, which is later used in a signed integer multiplication that overflows, causing the process to terminate with SIGILL via UBSan. This vulnerability is fixed in 3.4.9.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-34378 since 03/27/2026. 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 305086 (Linux Distros Unpatched Vulnerability : CVE-2026-34378), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.4.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (305086). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• AcademySoftwareFoundation

Name

• OpenEXR

Version

• 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/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion