CVE-2026-73635: Apache Struts

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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 products

• Apache Struts: from 2.0.0, up to and including 2.3.37; from 2.5.0, up to and including 2.5.33; from 6.0.0, before 6.11.0 (fixed in 6.11.0); from 7.0.0, before 7.3.0 (fixed in 7.3.0)

Published 2026-08-15. Last modified 2026-08-18.