How severe is CVE-2026-34589?

CVE-2026-34589 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-34589 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34589?

CVE-2026-34589 affects Openexr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34589?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-34589 have an EU (EUVD) identifier?

Yes. CVE-2026-34589 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19348.

When was CVE-2026-34589 published?

CVE-2026-34589 was published on 2026-04-06 and last updated on 2026-06-30.

CVE-2026-34589

CVE-2026-34589 is a medium-severity vulnerability in Openexr with a CVSS 3.x base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
CVSS v4: 8.4
EPSS exploit prediction: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19348
Weakness: CWE-190
Affected product: Openexr
Published: 2026-04-06
Last modified: 2026-06-30

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.

Frequently asked questions

What is CVE-2026-34589?: OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, the DWA lossy decoder constructs temporary per-component block pointers using signed 32-bit arithmetic. For a large enough width, the calculation overflows and later decoder stores operate on a wrapped pointer outside the allocated rowBlock backing store. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9.
How severe is CVE-2026-34589?: CVE-2026-34589 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-34589 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34589?: CVE-2026-34589 affects Openexr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34589?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34589 have an EU (EUVD) identifier?: Yes. CVE-2026-34589 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19348.
When was CVE-2026-34589 published?: CVE-2026-34589 was published on 2026-04-06 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*

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