CVE-2026-34378

MEDIUM

6.5

Description

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.

CVE Details

CVSS v3.1 Score6.5

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published4/6/2026

Last Modified4/7/2026

Sourcenvd

Honeypot Sightings0

Affected Products

openexr:openexr

Weaknesses (CWE)

CWE-190

References

https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9(security-advisories@github.com)

https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-v76p-4qvv-vh4g(security-advisories@github.com)

IOC Correlations

No correlations recorded

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