Is CVE-2026-26940 in the CISA KEV catalog?

No. CVE-2026-26940 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-26940?

CVE-2026-26940 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-26940?

CVE-2026-26940 has an EPSS score of 0.27% (19th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-26940?

Upgrade kibana to 9.3.2 or later.

CVE & CISA-KEV Catalog

CVE-2026-26940

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-1284

How to fix

Remediation Available

kibanaNVD

Affected:>= 9.3.0, < 9.3.2Fixed in:9.3.2CVE-2026-26940derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.27%probability of exploitation in 30 days

19thpercentile

Low risk: more likely to be exploited than 19% of all known CVEs.

References

Vendor Advisory1

discuss.elastic.co

Related Vulnerabilities

Other CWE-1284 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-20699	Critical	10.0	72%	KEV	-
CVE-2021-43267	Critical	9.8	58%	-	Fix
CVE-2022-31629	Medium	6.5	49%	-	Fix
CVE-2025-9316	Unscored	-	37%	-	-
CVE-2022-36620	High	7.5	23%	-	-
CVE-2008-1440	High	7.1	23%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-03-23.