How severe is CVE-2026-34543?

CVE-2026-34543 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-34543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34543?

CVE-2026-34543 affects Openexr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34543?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34543 have an EU (EUVD) identifier?

Yes. CVE-2026-34543 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18058.

When was CVE-2026-34543 published?

CVE-2026-34543 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-34543

CVE-2026-34543 is a high-severity vulnerability in Openexr with a CVSS 3.x base score of 7.5. 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-908.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (38th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-18058
Weakness: CWE-908
Affected product: Openexr
Published: 2026-04-01
Last modified: 2026-06-17

Description

OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, sensitive information from heap memory may be leaked through the decoded pixel data (information disclosure). This occurs under default settings; simply reading a malicious EXR file is sufficient to trigger the issue, without any user interaction. This issue has been patched in version 3.4.8.

Frequently asked questions

What is CVE-2026-34543?: OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From version 3.4.0 to before version 3.4.8, sensitive information from heap memory may be leaked through the decoded pixel data (information disclosure). This occurs under default settings; simply reading a malicious EXR file is sufficient to trigger the issue, without any user interaction. This issue has been patched in version 3.4.8.
How severe is CVE-2026-34543?: CVE-2026-34543 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-34543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (38th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34543?: CVE-2026-34543 affects Openexr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34543 have an EU (EUVD) identifier?: Yes. CVE-2026-34543 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-18058.
When was CVE-2026-34543 published?: CVE-2026-34543 was published on 2026-04-01 and last updated on 2026-06-17.

References

Affected products (1)

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

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