CVE-2026-0543 — Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation

Description (CNA)

Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.

Affected (CNA)

Vendor / product	Versions
Elastic / Kibana	affected 8.0.0 through 8.19.9; affected 7.0.0 through 7.17.29; affected 9.0.0 through 9.1.9; affected 9.2.0 through 9.2.3

CWE

CWE-20

References

https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.