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Fencer Vulns
medium 4.9

CVE-2026-26936 json

Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service

published 2026-02-26 8 mo ago modified 2026-09-08 2 mo ago also BIT-elk-2026-26936 , BIT-kibana-2026-26936 , EUVD-2026-8866

cvss
4.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).

Patch / fix

  • bitnami elk 8.19.11, 9.2.5
  • bitnami kibana 8.19.11, 9.2.5
  • elastic kibana 8.19.11, 9.2.5
  • elasticsearch kibana 8.19.11, 9.2.5

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
8 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami elk
>=8.0.0, <8.19.11
>=9.0.0, <9.2.5
8.19.11
9.2.5
bitnami kibana
>=8.0.0, <8.19.11
>=9.0.0, <9.2.5
8.19.11
9.2.5

Affected products

  • Elastic Kibana

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.