Resource exhaustion in Apache Struts - CVE-2026-73633
Published: August 24, 2026
Vulnerability identifier: #VU144841
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-73633
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the JSON plugin when handling a JSON request body to populate actions. A remote attacker can send a specially crafted request with an excessively large JSON body to cause a denial of service.
Only applications configured to populate actions from a JSON request body are vulnerable.
Affected software
Apache Struts
How to mitigate CVE-2026-73633
Install security update from vendor's website.
Apache Struts - addressed in versions 6.11.0, 7.3.0