Security readout for executives and security teams
Plain-English summary
CVE-2026-26936 is a Kibana availability issue. A flawed regular expression in the AI Inference Anonymization Engine can consume excessive processing resources and cause denial of service. The CVSS score is 4.9, mainly because exploitation requires high privileges and affects availability, not data confidentiality or integrity.
Executive priority
Treat this as a moderate operational resilience issue. It is not described as data theft or privilege escalation, but a successful attack could disrupt Kibana availability. Patch during the next security maintenance window, sooner for heavily used or externally reachable administrative environments.
Technical view
The issue is CWE-1333, inefficient regular expression complexity, causing possible Regular Expression Exponential Blowup in Kibana’s AI Inference Anonymization Engine. The CVSS vector is AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. Public data lists Elastic Kibana 8.0.0 and 9.0.0 as affected, with other versions defaulting to unaffected in the provided record.
Likely exposure
Exposure is most relevant for organizations running affected Kibana 8.x or 9.x builds where privileged users can reach AI Inference anonymization functionality. The provided evidence does not confirm internet-wide unauthenticated exposure or exact operational prerequisites beyond high privileges.
Exploitation context
The CVE record indicates network exploitability, low attack complexity, no user interaction, and high privileges required. CISA KEV status is false in the provided data, and no cited source states active exploitation or public weaponization.
Researcher notes
The public bundle is limited. It identifies the weakness, CVSS vector, affected product, and Elastic advisory link, but does not include detailed trigger conditions, proof of concept, or full fixed-version text. Avoid assuming affected ranges beyond the cited record and vendor advisory.
Mitigation direction
- Review Elastic advisory ESA-2026-14 for fixed versions and applicability.
- Prioritize applying Elastic’s Kibana security update if your version is affected.
- Limit high-privilege Kibana access to trusted administrators.
- Monitor Kibana resource usage for abnormal CPU or request slowdowns.
- If unable to patch, ask Elastic for supported temporary mitigations.
Validation and detection
- Inventory Kibana versions across production and non-production environments.
- Confirm whether AI Inference anonymization features are enabled or used.
- Map users and roles with access to the affected functionality.
- Check Elastic advisory details against your deployed version branch.
- Review logs and monitoring for availability degradation patterns.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1333: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-26936 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H1.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.9MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Inefficient Regular Expression Complexity
Inefficient Regular Expression Complexity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.