CVE-2026-0543Network attack vector

Authenticated service crash via crafted email address

Published Jan 13, 2026 · Updated Jan 13, 2026

Improper input validation in Elastic Kibana Email Connector allows remote authenticated users to crash Kibana via a crafted address. The connector processes a specially crafted email address without rejecting its malformed format, triggering excessive memory allocation. View-level privileges sufficient to execute connector actions are required, and the resulting outage persists for all users until Kibana is manually restarted.

CVSS severity6.5
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Elastic Kibana Email Connector allows remote authenticated users to crash Kibana via a crafted address. The connector processes a specially crafted email address without rejecting its malformed format, triggering excessive memory allocation. View-level privileges sufficient to execute connector actions are required, and the resulting outage persists for all users until Kibana is manually restarted.

The record

CVE
CVE-2026-0543
Published
Jan 13, 2026
Updated
Jan 13, 2026
Vendor
Elastic
Product
Kibana
Classifications
CWE-20, CWE-770, CAPEC-130, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.0 <=7.17.29
  2. Affected versionversion=8.0.0 <=8.19.9
  3. Affected versionversion=9.0.0 <=9.1.9
  4. Affected versionversion=9.2.0 <=9.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Elastic · Kibanaversion=7.0.0 <=7.17.29; version=8.0.0 <=8.19.9; version=9.0.0 <=9.1.9; version=9.2.0 <=9.2.3

Published CVSS scores

6.5ElasticCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-130Excessive Allocation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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