Signed Integer Overflow Vulnerability in OpenEXR by Academy Software Foundation
CVE-2026-34380

5.9MEDIUM

Key Information:

Vendor

Academysoftwarefoundation

Status
Openexr
Vendor
CVE Published:
6 April 2026

What is CVE-2026-34380?

A signed integer overflow vulnerability exists in OpenEXR's undo_pxr24_impl() function that can lead to buffer overflows. When processing large width values, the multiplication of width by 3 is performed as a signed 32-bit integer. This mathematical operation can result in undefined behavior, allowing the bounds check to fail and leading to potential memory corruption beyond the allocated output buffer. The issue has been resolved in versions 3.2.7, 3.3.9, and 3.4.9, and users are urged to update to these versions promptly.

Affected Version(s)

openexr >= 3.2.0, < 3.2.7 < 3.2.0, 3.2.7

openexr >= 3.3.0, < 3.3.9 < 3.3.0, 3.3.9

openexr >= 3.4.0, < 3.4.9 < 3.4.0, 3.4.9

References

https://github.com/AcademySoftwareFoundation/openexr/secu...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.