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PyOpenEXR CVE-2026-62986

| EUVDEUVD-2026-65705 MEDIUM
Information Exposure (CWE-200)
2026-08-25 GitHub_M
Python Information Disclosure Openexr Suse
4.3
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

Crafted file delivered over network with no auth required, but active user processing is necessary; impact is partial heap disclosure only, with no integrity or availability effect.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

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

Lifecycle Timeline

3
Patch available
Aug 25, 2026 - 20:06 EUVD
Source Code Evidence Fetched
Aug 25, 2026 - 19:08 vuln.today
Analysis Generated
Aug 25, 2026 - 19:08 vuln.today

DescriptionCVE.org

OpenEXR 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.

AnalysisAI

PyOpenEXR Python bindings in OpenEXR versions 3.3.0-3.3.12 and 3.4.0-3.4.13 leak uninitialized same-process heap memory to calling Python code when processing crafted deep scanline EXR files that contain layer-prefixed RGB channels. The flaw originates in PyPart::setDeepSliceData(), where lane assignment uses exact unprefixed string matching, leaving the green and blue NumPy array lanes uninitialized before returning them to the caller. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The vulnerable code path requires all four of the following conditions to be simultaneously true: (1) the application uses the PyOpenEXR Python bindings - the C/C++ library is unaffected; (2) the target EXR file is in deep scanline format specifically, not flat scanline or tiled; (3) the file's channels use layer-prefixed naming (e.g., left.R, left.G, left.B) rather than the conventional unprefixed R, G, B; and (4) channel coalescing is active, which is the default (separate_channels=False) and requires no explicit attacker-controlled configuration change. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor CVSS score of 4.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N) accurately reflects the constrained impact: a low-confidentiality information disclosure gated behind user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patches are OpenEXR 3.3.13 (for the 3.3.x branch) and 3.4.14 (for the 3.4.x branch), confirmed by the GitHub Security Advisory GHSA-pf59-r2mc-x746 and three upstream commits: 36ff0968de08d7ae80792f9f53402f93433207bb, 5105809507ba572d8cad12ec9f5a5c9d378354b9, and 5a534e2228c853034e5cb9d2599ebf82f48f51b0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 12 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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CVE-2026-62986 vulnerability details – vuln.today
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