Infinite Loop Vulnerability in OpenEXR Image Format Implementation by Academy Software Foundation
CVE-2026-55373

6.2MEDIUM

Key Information:

Vendor

Academysoftwarefoundation

Status
Openexr
Vendor
CVE Published:
25 August 2026

What is CVE-2026-55373?

OpenEXR, the reference implementation of the EXR image format utilized extensively within the motion picture industry, exhibits an infinite loop vulnerability in the SampleCountChannel component. Instances prior to versions 3.2.10, 3.3.12, and 3.4.13 are impacted. The issue arises within the roundListSizeUp() function, which is intended to round up the sample-list size but fails to progress when UINT_MAX is processed. This defect can be exploited through public OpenEXRUtil APIs, specifically by manipulating the sample-count buffer or through erroneous sample settings, leading to indefinite processing delays. Updated versions have rectified this vulnerability.

Affected Version(s)

openexr < 3.2.10 < 3.2.10

openexr >= 3.3.0, < 3.3.12 < 3.3.0, 3.3.12

openexr >= 3.4.0, < 3.4.13 < 3.4.0, 3.4.13

References

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

CVSS V3.1

Score:
6.2
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.