CVE-2026-34588 | Vulnerability Intelligence

Stored catalog record

Source record retrieved 2026-10-28T10:18:36.596046+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

Vulnerability overview

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.1.0 to before 3.2.7, 3.3.9, and 3.4.9, internal_exr_undo_piz() advances the working wavelet pointer with signed 32-bit arithmetic. Because nx, ny, and wcount are int, a crafted EXR file can make this product overflow and wrap. The next channel then decodes from an incorrect address. The wavelet decode path operates in place, so this yields both out-of-bounds reads and out-of-bounds writes. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Patch review priority

Assess exposure and vendor guidance

No higher-priority signal is available in the current stored evidence.

FIRST EPSS: 0.48% · percentile 41.4 · score date 2026-10-27.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score: 8.6 · HIGH
CVSS version: 4.0
CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses: CWE-125, CWE-190, CWE-787

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*
From (inclusive): 3.1.0
Before (exclusive): 3.2.7
cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*
From (inclusive): 3.3.0
Before (exclusive): 3.3.9
cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*
From (inclusive): 3.4.0
Before (exclusive): 3.4.9

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

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Read the official NVD record ↗

Explore the CISA catalog ↗

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