OpenEXR: PyOpenEXR deep prefixed RGB stale lane disclosure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-62986
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-25 19:16:52 UTC
Updated2026-08-25 20:17:00 UTC
DescriptionOpenEXR is the reference implementation and specification for the EXR image file format, widely used in the motion picture industry. In versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13, the PyOpenEXR Python bindings return stale heap data when reading a crafted deep scanline EXR that uses layer-prefixed RGB channels. With the default channel coalescing (separate_channels=False), the wrapper groups channels such as left.R, left.G, and left.B into a single RGB sample array, but the lane-offset calculation in PyPart::setDeepSliceData() only recognizes the exact unprefixed names G, B, and A. As a result, prefixed channels like left.G and left.B are decoded into lane 0 while lanes 1 and 2 are left uninitialized and returned to Python. A Python application that reads untrusted deep EXR files through the default OpenEXR.File API and then logs, serializes, previews, or otherwise processes the resulting NumPy sample arrays may expose uninitialized same-process heap contents, in addition to receiving incorrect green and blue channel data. This issue is fixed in versions 3.3.13 and 3.4.14.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

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

Problem Types: CWE-200 | CWE-457 | CWE-908 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-457 CWE-457: Use of Uninitialized Variable | CWE-908 CWE-908: Use of Uninitialized Resource

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA AcademySoftwareFoundation Openexr affected >= 3.3.0, < 3.3.13 Not specified
CNA AcademySoftwareFoundation Openexr affected >= 3.4.0, < 3.4.14 Not specified

References

ReferenceSourceLinkTags
github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-pf... [email protected] github.com
github.com/AcademySoftwareFoundation/openexr/commit/5105809507ba572d8cad... [email protected] github.com
github.com/AcademySoftwareFoundation/openexr/commit/5a534e2228c853034e5c... [email protected] github.com
github.com/AcademySoftwareFoundation/openexr/commit/36ff0968de08d7ae8079... [email protected] github.com
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