How severe is CVE-2026-34040?

CVE-2026-34040 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34040 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34040?

CVE-2026-34040 affects Docker Engine. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34040?

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-2026-34040 have an EU (EUVD) identifier?

Yes. CVE-2026-34040 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17289.

When was CVE-2026-34040 published?

CVE-2026-34040 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-34040

CVE-2026-34040 is a high-severity vulnerability in Docker Engine with a CVSS 3.x base score of 8.8. 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-288.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17289
Weakness: CWE-288
Affected product: Docker Engine
Published: 2026-03-31
Last modified: 2026-06-17

Description

Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in version 29.3.1.

Frequently asked questions

What is CVE-2026-34040?: Moby is an open source container framework. Prior to version 29.3.1, a security vulnerability has been detected that allows attackers to bypass authorization plugins (AuthZ). This issue has been patched in version 29.3.1.
How severe is CVE-2026-34040?: CVE-2026-34040 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34040 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34040?: CVE-2026-34040 affects Docker Engine. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34040?: 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-2026-34040 have an EU (EUVD) identifier?: Yes. CVE-2026-34040 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17289.
When was CVE-2026-34040 published?: CVE-2026-34040 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:docker:engine:*:*:*:*:*:*:*:*

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