Elasticsearch 8.x < 8.19.20 / 9.0.x < 9.4.5 / 9.5.x < 9.5.1 RCE (ESA-2026-114)

high Nessus Plugin ID 344317

Synopsis

The remote host is missing a security update.

Description

The version of Elasticsearch installed on the remote host is 8.x prior to 8.19.20, or 9.0.x prior to 9.4.5, or 9.5.x prior to 9.5.1. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-114 advisory.

- Deserialization of Untrusted Data (CWE-502) in the Elasticsearch machine learning component can lead to remote code execution via Object Injection (CAPEC-586). A specially crafted trained model artifact could cause attacker-controlled logic to execute with a materially broader system-call surface than intended.
Exploitation requires an authenticated user with sufficient privileges to create and deploy trained models.
(CVE-2026-72649)

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 8.19.20, 9.4.5, or 9.5.1 or later as appropriate for your release branch.

Plugin Details

Severity: High

ID: 344317

File Name: elasticsearch_ESA-2026-114.nasl

Version: 1.1

Type: Combined

Agent: unix

Family: Misc.

Published: 9/9/2026

Updated: 9/9/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.17

CVSS v2

Risk Factor: High

Base Score: 9

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

CVSS Score Source: CVE-2026-72649

CVSS v3

Risk Factor: High

Base Score: 8.8

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

Vulnerability Information

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

Required KB Items: installed_sw/Elasticsearch

Patch Publication Date: 9/1/2026

Vulnerability Publication Date: 9/1/2026

Reference Information

CVE: CVE-2026-72649

Detections

Analytics