Apache Struts 2.5.14 <= 2.5.33 / 6.x < 6.12.0 / 7.x < 7.4.0 Denial of Service (S2-076)

high Nessus Plugin ID 364467

Synopsis

The Apache Struts install on the remote host is affected by a denial of service vulnerability.

Description

The version of Apache Struts installed on the remote host is 2.5.14 through 2.5.33, or 6.x prior to 6.12.0, or 7.x prior to 7.4.0. It is, therefore, affected by a denial of service vulnerability, as referenced in the S2-076 advisory:

- Asymmetric resource consumption (amplification) vulnerability in Apache Struts. When a request parameter is bound to an arbitrary-precision decimal (java.math.BigDecimal) property that is then rendered through the Struts tag library, the framework can produce a response many orders of magnitude larger than the request, allowing an unauthenticated remote attacker to exhaust server CPU and outbound network capacity with sustained low-volume traffic. Applications that do not bind request parameters to BigDecimal properties, or never render such a property through the Struts tag library, are not affected. (CVE-2026-104712)

Nessus cannot verify whether the application binds request parameters to BigDecimal properties and renders them through the Struts tag library, so this finding is flagged as a potential vulnerability.

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 Apache Struts version 6.12.0 / 7.4.0 or later. Alternatively, apply the workaround as referenced in the vendor's security bulletin.

Plugin Details

Severity: High

ID: 364467

File Name: struts_S2-076.nasl

Version: 1.1

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 10/9/2026

Updated: 10/9/2026

Configuration: Enable paranoid mode, Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.68

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/a:apache:struts

Required KB Items: Settings/ParanoidReport

Patch Publication Date: 10/2/2026

Vulnerability Publication Date: 10/5/2026

Reference Information

CVE: CVE-2026-104712

IAVA: 2026-A-1088

Detections

Analytics