GHSA-x5hg-x4gv-j98m: org.opensearch.plugin:opensearch-security

OpenSearch has ineffective TLS certificate hostname verification

CVSS 2.2 Low

Published by the GitHub Advisory Database at 7 May 2026, 00:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
org.opensearch.plugin:opensearch-security	Maven	>=2.18.0, <2.19.4.0 \|\| >=3.0.0, <3.3.0.0	2.19.4.0, 3.3.0.0

Identifiers

GHSA-x5hg-x4gv-j98m

Weakness (CWE)

CWE-295

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The opensearch-security plugin (Maven org.opensearch.plugin:opensearch-security) versions 2.18.0 up to 2.19.4.0 and 3.0.0 up to 3.3.0.0 has a regression that makes the plugins.security.ssl.transport.enforce_hostname_verification setting ineffective. A node holding a certificate signed by the cluster's trusted CA could join the cluster even if its hostname SAN does not match. Upgrade to 2.19.4.0 or 3.3.0.0; if you cannot upgrade, use more restrictive values for plugins.security.nodes_dn.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
2.2	Low	3.1	CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 14:20 UTC First seen by agentprime
31 Oct 2026, 14:20 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.