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🛡️ GHSA-x5hg-x4gv-j98m — opensearch-security

🟢 CVSS 2.0 — Low ✅ No Known Exploit CWE-295 OSV
2.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

OpenSearch has ineffective TLS certificate hostname verification

Description

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.

Impact

Clusters running affected versions with hostname verification enabled did not receive the expected protection from this setting. A node presenting a certificate signed by the cluster's trusted CA could join the cluster regardless of whether its hostname SAN matched. This regression does not affect certificate validation itself — only the additional hostname verification check.

Patches

This issue is fixed in OpenSearch 2.19.4 and 3.3.0.

Workarounds

Use more restrictive values for plugins.security.nodes_dn to limit which certificates are accepted for node-to-node communication.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

GHSA-x5hg-x4gv-j98m is classified as CWE-295: Improper Certificate Validation. A TLS certificate is accepted without proper verification, so a man-in-the-middle can present their own.

Affected software

GHSA-x5hg-x4gv-j98m is recorded against 1 package.

  • org.opensearch.plugin:opensearch-security (from 3.0.0 up to 3.3.0.0)

Timeline and source

Published on 7 May 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)

Details

Severity LOW
CVSS Score 2.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N
CWE CWE-295
Public Exploit ✅ No
Source OSV
Published 2026-05-07
Updated 2026-08-20
Modified 2026-05-07
Fix URL N/A

Affected Packages

Software From version Fixed in
org.opensearch.plugin:opensearch-security 3.0.0 3.3.0.0

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