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CVE-2026-84939— Apache FreeMarker, Apache FreeMarker: A malformed locale may be exploitable for path traversal attacks

Quick assessment

Affected
Apache Software Foundation Apache FreeMarker
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.

以下是这段漏洞描述的中文翻译： Apache FreeMarker 模板加载机制中存在路径遍历漏洞。如果攻击者能够向 FreeMarker 指定任意格式错误的 locale（区域设置）标识符，且启用了本地化查找配置（该配置默认启用），则可能触发此漏洞。 受影响版本： 该问题影响 Apache FreeMarker 2.2.0 至 2.3.34 版本。 修复与缓解措施： 建议用户升级至 2.3.35 版本。对于较早版本，也可通过禁用本地化查找功能来缓解此漏洞。 补充说明： 需要注意的是，即使在使用受影响版本时，可加载

AI Predicted 6.5 Difficulty: Moderate
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I. Basic Information for CVE-2026-84939

Vulnerability Information
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Vulnerability Title
Apache FreeMarker, Apache FreeMarker: A malformed locale may be exploitable for path traversal attacks
Source: CVE Program / CVE List V5
Vulnerability Description
Path traversal vulnerability in Apache FreeMarker template loading mechanism, if the attacker can specify an arbitrary malformed locale identifier to FreeMarker, and the localized lookup configuration setting is enabled (it's by default enabled). This issue affects Apache FreeMarker from 2.2.0 through 2.3.34. Users are recommended to upgrade to version 2.3.35. Disabling localized lookup in previous versions also mitigates this. Note that even in versions affected by this vulnerability, the files that can be loaded remain restricted by the TemplateLoader that FreeMarker is configured to use. In particular, FileTemplateLoader prevents attempts to traverse outside the baseDir specified in its constructor. Other TemplateLoader implementations may allow access outside their designated base directory, but they are still constrained by the underlying storage mechanism—for example, a loader wrapping a Java class loader can only access resources that the class loader can load, while one wrapping a web application context can only access resources available through that context.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache FreeMarker 2.2.0 ~ 2.3.34 -
Apache Software Foundation Apache FreeMarker 2.2.0 ~ 2.3.34 -

II. Public POCs for CVE-2026-84939

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III. Intelligence Information for CVE-2026-84939

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Mailing List Discussions for CVE-2026-84939 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-10 · 11 CVEs total

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IV. Related Vulnerabilities

Same vendor: Apache Software Foundation
Same weakness: CWE-23

V. Comments for CVE-2026-84939

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