CVE-2026-73635: Apache Struts: Unbounded growth of localized-text caches driven by the request locale
Allocation of resources without limits or throttling vulnerability in Apache Struts. When no fixed locale is configured, the locale used for localized-text lookups is taken from the incoming request, allowing an unauthenticated remote client to cause the framework's internal localized-text caches to grow without bound and exhaust the Java heap, denying service to other users. Applications that configure a fixed locale are not affected.
This issue affects Apache Struts: from 2.0.0 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Strutsto a version that resolves this vulnerability.Fixed in 6.11.0 - Upgrade
Upgrade
Apache Strutsto a version that resolves this vulnerability.Fixed in 7.3.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-73635?
CVE-2026-73635 has a risk rating of 36, indicating a moderate severity level.
How do I fix CVE-2026-73635?
To mitigate CVE-2026-73635, ensure that a fixed locale is configured in your Apache Struts application.
What systems are affected by CVE-2026-73635?
CVE-2026-73635 affects all versions of Apache Struts that allow unbounded growth of localized-text caches.
Who can exploit CVE-2026-73635?
CVE-2026-73635 can be exploited by unauthenticated remote clients sending requests without a fixed locale.
What are the potential impacts of CVE-2026-73635?
The exploitation of CVE-2026-73635 can lead to resource exhaustion due to unbounded growth of localized-text caches.