Apache Struts 2.x-7.x DoS via Unbounded Locale-Dependent Cache Growth
CVE-2026-73635 Published on August 15, 2026
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.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-73635
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Affected Versions
Apache Software Foundation Apache Struts:- Version 2.0.0, <= 2.3.37 is affected.
- Version 2.5.0, <= 2.5.33 is affected.
- Version 6.0.0, <= 6.10.0 is affected.
- Version 7.0.0, <= 7.2.1 is affected.