Apache Struts 6.0.0 <=> 6.10.0 / 7.0.0 <=> 7.2.1 Denial of Service (S2-073)

high Nessus Plugin ID 338627

Synopsis

Apache Struts installed on the remote host is affected by Denial of Service vulnerability

Description

The version of Apache Struts installed on the remote host is 6.0.0 prior to 6.11.0, or 7.0.0 prior to 7.3.0. It is, therefore, affected by a denial of service vulnerability as referenced in the S2-073 advisory.

- Struts provides an optional facility for collecting Content Security Policy violation reports submitted by browsers. An application that exposes such a collection endpoint reads the submitted report into memory without bounding how much it will accept. A single request can therefore cause the server to allocate memory in proportion to the size of the request, exhausting the heap and denying service to other users.
Endpoints of this kind are ordinarily reachable without authentication, because browsers submit to them directly. Unlike a plugin-specific issue, the affected facility ships as part of the Struts core. It is nevertheless inert until an application explicitly maps an endpoint to collect the reports: the core distribution maps no such endpoint by default, and enabling the Content Security Policy support alone does not expose one. Applications that do not collect violation reports are therefore not affected, whichever of the listed versions they run. (CVE-2026-73634)

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 6.11.0 / 7.3.0 or later. Alternatively, apply the workaround as referenced in the vendor's security bulletin.

Plugin Details

Severity: High

ID: 338627

File Name: struts_S2-073.nasl

Version: 1.2

Type: Local

Agent: windows, macosx, unix

Family: Misc.

Published: 8/21/2026

Updated: 8/21/2026

Configuration: Enable paranoid mode

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.67

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-73634

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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:apache:struts

Required KB Items: Settings/ParanoidReport, Host/OS

Exploit Ease: No known exploits are available

Patch Publication Date: 8/1/2026

Vulnerability Publication Date: 7/28/2026

Reference Information

CVE: CVE-2026-73634

IAVA: 2026-A-0858

Detections

Analytics