Detections
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Elasticsearch 8.x < 8.19.20 / 9.0.x < 9.3.0 DoS (ESA-2026-47)

medium Nessus Plugin ID 344316

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 9.3.0. It is, therefore, affected by a vulnerability as referenced in the ESA-2026-47 advisory.

 - Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a denial of service via Excessive Allocation (CAPEC-130). A user with elevated privileges can submit a specially crafted request that causes excessive memory consumption, which may render the affected node unavailable.
 (CVE-2026-56143)

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 or 9.3.0 or later as appropriate for your release branch.

See Also

http://www.nessus.org/u?e53247a5

Plugin Details

Severity: Medium

ID: 344316

File Name: elasticsearch_ESA-2026-47.nasl

Version: 1.2

Type: Combined

Agent: unix

Family: Misc.

Published: 9/9/2026

Updated: 9/10/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.62

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2026-56143

CVSS v3

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.3

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

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

Required KB Items: installed_sw/Elasticsearch

Exploit Ease: No known exploits are available

Patch Publication Date: 9/1/2026

Vulnerability Publication Date: 9/1/2026

Reference Information

CVE: CVE-2026-56143