CVE-2026-42399 — MEDIUM (6.5)

Q: How severe is CVE-2026-42399?

CVE-2026-42399 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-42399?

Check the references section above for vendor advisories and patch information. Affected products include: Elastic Kibana.

Vulnerability Description

Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated low-privileged user can cause Kibana to consume exponentially increasing amounts of memory by submitting a specially crafted Timelion visualization expression containing deeply chained function calls. The resulting data structure grows without bound, exhausting available memory and causing the Kibana service to crash and become unavailable to all users.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Elastic	Kibana	>= 8.0.0, < 8.19.16

Related Weaknesses (CWE)

CWE-400

References

https://discuss.elastic.co/t/kibana-8-19-16-and-9-3-5-security-update-esa-2026-3Vendor Advisory

FAQ

What is CVE-2026-42399?

CVE-2026-42399 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated low-privileged user can cause Kibana to consume exponentially...

How severe is CVE-2026-42399?

CVE-2026-42399 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42399?

Check the references section above for vendor advisories and patch information. Affected products include: Elastic Kibana.