CVE-2026-73633

HIGH CVSS 3.1: 7.5 EPSS 0.50%
Updated Aug 18, 2026
Apache
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions 2.1.8 — 7.3.0
Fixed In 6.11.0
Type CWE-400 (Uncontrolled Resource Consumption)
Vendor Apache
Public PoC No

Uncontrolled resource consumption vulnerability in the JSON plugin of Apache Struts. When an application is configured to populate actions from a JSON request body, the plugin reads that body into memory without bounding how much it will accept, so a single request can exhaust the heap and deny service to other users. The plugin's configurable JSON input length limit does not bound this read.

The JSON plugin is an optional component; applications that do not use it, or use it without enabling JSON request-body handling, are not affected. This issue affects Apache Struts: from 2.1.8 through 2.3.37, from 2.5.0 through 2.5.33, from 6.0.0 through 6.10.0, from 7.0.0 through 7.2.1. Users are recommended to upgrade to version 6.11.0 or 7.3.0, which fixes the issue.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 4

Configuration From (including) Up to (excluding)
Apache Struts
cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
2.1.8 <= 2.3.37
Apache Struts
cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
2.5.0 <= 2.5.33
Apache Struts
cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
6.0.0 6.11.0
Apache Struts
cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
7.0.0 7.3.0