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Elastic Beats filebeat 8.0.x < 8.19.18 / 9.0.x < 9.3.1 DoS (ESA-2026-165)

medium Nessus Plugin ID 342651

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Synopsis

Elastic Beats filebeat installed on the remote Windows host is affected by a denial of service vulnerability.

Description

The version of Elastic Beats filebeat installed on the remote host is 8.0.x prior to 8.19.18, or 9.0.x prior to 9.3.1.
It is, therefore, affected by a denial of service vulnerability.

 - Allocation of Resources Without Limits or Throttling (CWE-770) in Filebeat can lead to a denial of service via Excessive Allocation (CAPEC-130). An attacker able to reach the Filebeat HTTP ingestion endpoint could send specially crafted compressed requests that exhaust the memory resources of the Filebeat process.
 (CVE-2026-78588)

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 Elastic Beats filebeat version 8.19.18, 9.3.1 or later.

See Also

http://www.nessus.org/u?307dc201

Plugin Details

Severity: Medium

ID: 342651

File Name: elastic_beats_filebeat_ESA-2026-165.nasl

Version: 1.2

Type: Local

Agent: windows

Family: Windows

Published: 9/3/2026

Updated: 9/4/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.64

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-78588

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: x-cpe:/a:elastic:beats_filebeat

Required KB Items: Settings/ParanoidReport, SMB/Registry/Enumerated, installed_sw/Beats filebeat

Exploit Ease: No known exploits are available

Patch Publication Date: 9/1/2026

Vulnerability Publication Date: 9/2/2026

Reference Information

CVE: CVE-2026-78588

CWE: 770