CVE-2026-73634

Analyzed Analyzed - Analysis Complete

Uncontrolled Resource Consumption in Apache Struts

Publication date: 2026-08-15

Last updated on: 2026-08-18

Assigner: Apache Software Foundation

Description

Uncontrolled resource consumption vulnerability in Apache Struts. An application that exposes an endpoint collecting Content Security Policy violation reports reads the submitted report into memory without bounding how much it will accept, so a single request can exhaust the heap and deny service to other users. Such endpoints are ordinarily reachable without authentication. The core distribution maps no such endpoint by default; applications that do not collect violation reports are not affected. This issue affects Apache Struts: 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

EPSS Scores

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Meta Information

Published

2026-08-15

Last Modified

2026-08-18

Generated

2026-09-04

AI Q&A

2026-08-15

EPSS Evaluated

2026-09-03

NVD

CVE-2026-73634

EUVD

EUVD-2026-59603

Affected Vendors & Products

Vendor	Product	Version / Range
apache	struts	From 6.0.0 (inc) to 6.11.0 (exc)
apache	struts	From 7.0.0 (inc) to 7.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This is an uncontrolled resource consumption vulnerability in Apache Struts. It occurs when an application exposes an endpoint that collects Content Security Policy violation reports. The endpoint reads submitted reports into memory without limits, allowing a single request to exhaust server heap memory and deny service to other users. Such endpoints are typically accessible without authentication.

Detection Guidance

Check if your Apache Struts application exposes an endpoint collecting Content Security Policy violation reports. Inspect network traffic for unusually large requests targeting such endpoints. Monitor system memory usage for sudden heap exhaustion during traffic spikes.

Impact Analysis

This vulnerability can cause denial of service by crashing the application due to memory exhaustion. It may disrupt services for other users if the server becomes unresponsive. Systems relying on the affected Struts versions could experience downtime or degraded performance.

Compliance Impact

This vulnerability primarily causes denial-of-service by exhausting system resources, which could lead to service unavailability. While it does not directly violate GDPR or HIPAA, prolonged downtime may impact data processing obligations under these regulations, potentially leading to compliance issues if critical services are disrupted.

Mitigation Strategies

Upgrade Apache Struts to version 6.11.0 or 7.3.0. If upgrading is not immediately possible, disable or restrict access to any Content Security Policy violation report collection endpoints in your application configuration.

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