Vulnerability details
CVE-2026-73633
Apache Struts: Unbounded read of a JSON request body
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Apache Software Foundation | Apache Struts | 2.1.8 ≤ v ≤ 2.3.37 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Struts | 2.5.0 ≤ v ≤ 2.5.33 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Struts | 6.0.0 ≤ v ≤ 6.10.0 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Struts | 7.0.0 ≤ v ≤ 7.2.1 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://cwiki.apache.org/confluence/display/WW/S2-072 vendor-advisory
Details
- Published
- 2026-08-14
- Last updated
- 2026-08-14
- State
- Published
- Assigner (CNA)
- apache
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-400Uncontrolled Resource Consumption