Resource Exhaustion in Apache Struts Affects Unauthenticated Users
CVE-2026-73635

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Struts
Vendor
CVE Published:
15 August 2026

What is CVE-2026-73635?

A resource exhaustion vulnerability exists in Apache Struts that can be exploited by unauthenticated remote clients. When a fixed locale is not configured, the framework's internal localized-text caches can grow indefinitely based on the locale provided in incoming requests. This unchecked growth can lead to Java heap exhaustion, which in turn denies service to legitimate users. Affected users are strongly advised to upgrade to Apache Struts version 6.11.0 or 7.3.0 to mitigate this issue.

Affected Version(s)

Apache Struts 2.0.0 <= 2.3.37

Apache Struts 2.5.0 <= 2.5.33

Apache Struts 6.0.0 <= 6.10.0

References

https://cwiki.apache.org/confluence/display/WW/S2-074
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kuniyoshi Noguchi (野口 晋義), (@KuniNogu)
.