Detections
Analytics

Elasticsearch 9.2.x / 9.2.8 / 9.3.x / 9.3.8 / 9.4.x < 9.4.8 / 9.5.x < 9.5.5 DoS (ESA-2026-190)

medium Nessus Plugin ID 364386

Synopsis

The remote host is missing a security update.

Description

The version of Elasticsearch installed on the remote host is prior to 9.4.8 or 9.5.5. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-190 advisory.

 - Uncontrolled Recursion (CWE-674) in Elasticsearch can allow an authenticated user with low privileges to terminate an Elasticsearch node, resulting in denial of service, via Excessive Allocation (CAPEC-130).
 (CVE-2026-102409)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Elasticsearch version 9.4.8, or 9.5.5 or later as appropriate for your release branch.

See Also

https://discuss.elastic.co/t/390863

Plugin Details

Severity: Medium

ID: 364386

File Name: elasticsearch_esa_2026_190.nasl

Version: 1.2

Type: Combined

Agent: unix

Family: Misc.

Published: 10/9/2026

Updated: 10/9/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.67

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2026-102409

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/a:elastic:elasticsearch, cpe:/a:elasticsearch:elasticsearch

Required KB Items: installed_sw/Elasticsearch

Patch Publication Date: 10/6/2026

Vulnerability Publication Date: 10/6/2026

Reference Information

CVE: CVE-2026-102409

IAVA: 2026-A-1094