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Fencer Vulns
medium 6.5

CVE-2026-26940 json

Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service

published 2026-03-19 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-13145

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • elastic kibana 8.19.13, 9.2.7, 9.3.2

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-26940 updated cvss 6.5

Kibana: Timelion: Kibana Timelion Plugin: Denial of Service via improper input validation in Timelion expressions

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8, openshift-logging/elasticsearch-rhel9-operator, openshift-logging/cluster-logging-rhel9-operator Red Hat JBoss Enterprise Application Platform 8 kibana Red Hat JBoss Enterprise Application Platform Expansion Pack kibana Red Hat OpenShift distributed tracing 3 rhosdt/tempo-jaeger-query-rhel9 Red Hat OpenStack Platform 16.2 puppet-kibana3
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Elastic Kibana

Classification

Weakness
  • CWE-1284 Improper Validation of Specified Quantity in Input

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.