How severe is CVE-2026-42217?

CVE-2026-42217 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-42217 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42217?

CVE-2026-42217 affects Openexr. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42217?

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

Does CVE-2026-42217 have an EU (EUVD) identifier?

Yes. CVE-2026-42217 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28300.

When was CVE-2026-42217 published?

CVE-2026-42217 was published on 2026-05-07 and last updated on 2026-06-17.

CVE-2026-42217

CVE-2026-42217 is a critical-severity vulnerability in Openexr with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v4: 6.3
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28300
Weakness: CWE-190
Affected product: Openexr
Published: 2026-05-07
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 versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger() decodes a variable-length integer from untrusted EXR input without bounding the shift count. After enough continuation bytes, the code executes a left shift by 70 on a 64-bit value, which is undefined behavior. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.

Frequently asked questions

What is CVE-2026-42217?: OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From versions 3.0.0 to before 3.2.9, 3.3.0 to before 3.3.11, and 3.4.0 to before 3.4.11, readVariableLengthInteger() decodes a variable-length integer from untrusted EXR input without bounding the shift count. After enough continuation bytes, the code executes a left shift by 70 on a 64-bit value, which is undefined behavior. This issue has been patched in versions 3.2.9, 3.3.11, and 3.4.11.
How severe is CVE-2026-42217?: CVE-2026-42217 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-42217 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42217?: CVE-2026-42217 affects Openexr. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42217?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-42217 have an EU (EUVD) identifier?: Yes. CVE-2026-42217 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28300.
When was CVE-2026-42217 published?: CVE-2026-42217 was published on 2026-05-07 and last updated on 2026-06-17.

References

Affected products (1)

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

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