How severe is CVE-2026-34086?

CVE-2026-34086 has a CVSS 4.0 base score of 2.1, rated low severity.

Is CVE-2026-34086 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34086?

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

Does CVE-2026-34086 have an EU (EUVD) identifier?

Yes. CVE-2026-34086 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29058.

When was CVE-2026-34086 published?

CVE-2026-34086 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-34086

CVE-2026-34086 is a low-severity vulnerability with a CVSS 4.0 base score of 2.1. 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-20.

Key facts

Severity: Low (CVSS 4.0 base score 2.1)
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29058
Weakness: CWE-20
Published: 2026-05-11
Last modified: 2026-06-17

Description

Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.

Frequently asked questions

What is CVE-2026-34086?: Vulnerability in Wikimedia Foundation AbuseFilter. This issue affects AbuseFilter: from * before 1.43.7, 1.44.4, 1.45.2.
How severe is CVE-2026-34086?: CVE-2026-34086 has a CVSS 4.0 base score of 2.1, rated low severity.
Is CVE-2026-34086 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-34086?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34086 have an EU (EUVD) identifier?: Yes. CVE-2026-34086 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29058.
When was CVE-2026-34086 published?: CVE-2026-34086 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://phabricator.wikimedia.org/T415584

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