How severe is CVE-2026-26940?

CVE-2026-26940 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-26940 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26940?

CVE-2026-26940 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26940?

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

Does CVE-2026-26940 have an EU (EUVD) identifier?

Yes. CVE-2026-26940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13145.

When was CVE-2026-26940 published?

CVE-2026-26940 was published on 2026-03-19 and last updated on 2026-06-17.

CVE-2026-26940

CVE-2026-26940 is a medium-severity vulnerability in Elastic Kibana with a CVSS 3.x base score of 6.5. 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-1284.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13145
Weakness: CWE-1284
Affected product: Elastic Kibana
Published: 2026-03-19
Last modified: 2026-06-17

Description

Improper Validation of Specified Quantity in Input (CWE-1284) in the Timelion visualization plugin in Kibana can lead Denial of Service via Excessive Allocation (CAPEC-130). The vulnerability allows an authenticated user to send a specially crafted Timelion expression that overwrites internal series data properties with an excessively large quantity value.

Frequently asked questions

What is CVE-2026-26940?: Improper Validation of Specified Quantity in Input (CWE-1284) in the Timelion visualization plugin in Kibana can lead Denial of Service via Excessive Allocation (CAPEC-130). The vulnerability allows an authenticated user to send a specially crafted Timelion expression that overwrites internal series data properties with an excessively large quantity value.
How severe is CVE-2026-26940?: CVE-2026-26940 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-26940 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26940?: CVE-2026-26940 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26940?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-26940 have an EU (EUVD) identifier?: Yes. CVE-2026-26940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13145.
When was CVE-2026-26940 published?: CVE-2026-26940 was published on 2026-03-19 and last updated on 2026-06-17.

References

https://discuss.elastic.co/t/kibana-8-19-13-9-2-7-9-3-2-security-update-esa-2026-20/385535

Affected products (1)

cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*

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