CVE-2026-73633

7.5

Apache Software Foundation · Apache Struts

The JSON plugin in Apache Struts is susceptible to an uncontrolled resource consumption vulnerability that may lead to denial of service.

Executive summary

An uncontrolled resource consumption vulnerability in the Apache Struts JSON plugin poses a risk of service interruption through denial-of-service attacks.

Vulnerability

The vulnerability (CWE-400) exists within the JSON plugin, allowing unauthenticated attackers to trigger excessive resource consumption. This can lead to application instability or total service unavailability.

Business impact

With a CVSS score of 7.5, this vulnerability represents a significant threat to business continuity. Successful exploitation allows for a denial-of-service condition, which can halt critical business operations and lead to substantial downtime for applications relying on the Apache Struts framework.

Remediation

Immediate Action: Consult the official Apache Struts security bulletin S2-072 for guidance on mitigating this resource consumption issue, as a specific patch version was not explicitly provided in the source data.

Proactive Monitoring: Monitor server resource utilization, specifically CPU and memory consumption, for sudden spikes that may indicate an ongoing denial-of-service attempt.

Compensating Controls: Implement rate limiting and request size restrictions at the network or application layer to mitigate the impact of excessive resource requests.

Exploitation status

Public Exploit Available: Yes, a public proof-of-concept exists on GitHub.

Analyst recommendation

The availability of a public proof-of-concept necessitates immediate attention to this vulnerability. Administrators should review the Apache Struts security advisory S2-072 and apply the recommended configurations or updates as soon as they become available to prevent potential service outages.

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