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CVE-2026-73635— Apache Struts: Unbounded growth of localized-text caches driven by the request locale

Quick assessment

Affected
Apache Software Foundation Apache Struts
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Struts是美国Apache基金会开源的一款基于MVC模式的Java Web应用框架。 Apache Struts 2.0.0版本至2.3.37版本、2.5.0版本至2.5.33版本、6.0.0版本至6.10.0版本和7.0.0版本至7.2.1版本存在资源管理错误漏洞，该漏洞源于对资源分配无限制或节流，当未配置固定locale时，本地化文本查找使用的locale取自传入请求，可能导致未经身份验证的远程客户端使内部本地化文本缓存无限增长并耗尽Java堆，造成拒绝服务。

AI Predicted 7.5 Difficulty: Easy EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
Apache Software Foundation Apache Struts 2.0.0≤ 2.3.37 affected
2.5.0≤ 2.5.33 affected
6.0.0≤ 6.10.0 affected
7.0.0≤ 7.2.1 affected
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I. Basic Information for CVE-2026-73635

Vulnerability Information
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Vulnerability Title
Apache Struts: Unbounded growth of localized-text caches driven by the request locale
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Struts 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Struts是美国Apache基金会开源的一款基于MVC模式的Java Web应用框架。 Apache Struts 2.0.0版本至2.3.37版本、2.5.0版本至2.5.33版本、6.0.0版本至6.10.0版本和7.0.0版本至7.2.1版本存在资源管理错误漏洞，该漏洞源于对资源分配无限制或节流，当未配置固定locale时，本地化文本查找使用的locale取自传入请求，可能导致未经身份验证的远程客户端使内部本地化文本缓存无限增长并耗尽Java堆，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Struts 2.0.0 ~ 2.3.37 -

II. Public POCs for CVE-2026-73635

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III. Intelligence Information for CVE-2026-73635

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Vendor Advisories for CVE-2026-73635 (1)

Same Patch Batch · Apache Software Foundation · 2026-08-15 · 4 CVEs total

CVE-2026-73634 Apache Struts: Unbounded read of a Content Security Policy violation report
CVE-2026-73631 Apache Struts: Shared parsing state in the JSON plugin
CVE-2026-73632 Apache Struts: Shared serialization state in the JSON plugin

IV. Related Vulnerabilities

Same product: Apache Struts
Same vendor: Apache Software Foundation
Same weakness: CWE-770

V. Comments for CVE-2026-73635

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