Allocation of resources without limits or throttling vulnerability in Apache Struts. (CVE-2026-73635)
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.
AI Analysis
Technical Summary
CVE-2026-73635 is a resource exhaustion vulnerability in Apache Struts affecting versions 2.0.0 through 2.3.37, 2.5.0 through 2.5.33, 6.0.0 through 6.10.0, and 7.0.0 through 7.2.1. When no fixed locale is configured, the locale for localized-text lookups is derived from the incoming request, allowing an unauthenticated remote client to cause the internal localized-text caches to grow indefinitely. This unbounded growth can exhaust the Java heap, resulting in denial of service to other users. The vulnerability is mitigated by configuring a fixed locale or upgrading to Apache Struts versions 6.11.0 or 7.3.0 where the issue is fixed.
Potential Impact
An unauthenticated remote attacker can cause the Apache Struts framework to consume excessive memory by forcing unbounded growth of localized-text caches, leading to Java heap exhaustion and denial of service. This impacts availability of applications using vulnerable versions without a fixed locale configuration.
Mitigation Recommendations
Users should upgrade to Apache Struts versions 6.11.0 or 7.3.0 where this vulnerability is fixed. Alternatively, configuring a fixed locale in the application prevents exploitation of this issue. No other mitigation is indicated by the vendor advisory.
Allocation of resources without limits or throttling vulnerability in Apache Struts. (CVE-2026-73635)
Description
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.
CVSS v3.1
Score 7.5high
Affected software
pkg:maven/org.apache.struts/struts2-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-73635 is a resource exhaustion vulnerability in Apache Struts affecting versions 2.0.0 through 2.3.37, 2.5.0 through 2.5.33, 6.0.0 through 6.10.0, and 7.0.0 through 7.2.1. When no fixed locale is configured, the locale for localized-text lookups is derived from the incoming request, allowing an unauthenticated remote client to cause the internal localized-text caches to grow indefinitely. This unbounded growth can exhaust the Java heap, resulting in denial of service to other users. The vulnerability is mitigated by configuring a fixed locale or upgrading to Apache Struts versions 6.11.0 or 7.3.0 where the issue is fixed.
Potential Impact
An unauthenticated remote attacker can cause the Apache Struts framework to consume excessive memory by forcing unbounded growth of localized-text caches, leading to Java heap exhaustion and denial of service. This impacts availability of applications using vulnerable versions without a fixed locale configuration.
Mitigation Recommendations
Users should upgrade to Apache Struts versions 6.11.0 or 7.3.0 where this vulnerability is fixed. Alternatively, configuring a fixed locale in the application prevents exploitation of this issue. No other mitigation is indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-prrh-5r25-ch75
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-73635"]
- State
- PUBLISHED
Threat ID: 6a808b65bf8831d5394f4765
Added to database: 08/15/2026, 15:53:09 UTC
Last enriched: 08/15/2026, 15:54:44 UTC
Last updated: 09/29/2026, 18:13:09 UTC
Views: 75
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