How severe is CVE-2026-42400?

CVE-2026-42400 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-2026-42400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42400?

CVE-2026-42400 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42400?

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

Does CVE-2026-42400 have an EU (EUVD) identifier?

Yes. CVE-2026-42400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33030.

When was CVE-2026-42400 published?

CVE-2026-42400 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-42400

CVE-2026-42400 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-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33030
Weakness: CWE-400
Affected product: Elastic Kibana
Published: 2026-05-28
Last modified: 2026-06-17

Description

Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can result in a Kibana instance becoming unresponsive or crashing.

Frequently asked questions

What is CVE-2026-42400?: Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can result in a Kibana instance becoming unresponsive or crashing.
How severe is CVE-2026-42400?: CVE-2026-42400 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-2026-42400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42400?: CVE-2026-42400 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42400?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42400 have an EU (EUVD) identifier?: Yes. CVE-2026-42400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33030.
When was CVE-2026-42400 published?: CVE-2026-42400 was published on 2026-05-28 and last updated on 2026-06-17.

References

https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-35/386554

Affected products (1)

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

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