GHSA-x5hg-x4gv-j98m
Low · 2.2OpenSearch has ineffective TLS certificate hostname verification
CVSS
2.2
EPSS
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Published
May 7, 2026
CISA due date
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The record
A regression was introduced in OpenSearch 2.18.0 that caused the `plugins.security.ssl.transport.enforce_hostname_verification` setting to be ineffective. When this setting was enabled, OpenSearch did not verify that the hostname in a connecting node's TLS certificate matched the hostname of the connection. This could allow a node with a valid certificate (signed by the cluster's trusted CA) but an incorrect hostname SAN to join the cluster.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|
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