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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.

Apache FreeMarker是美国Apache基金会的一款服务端软件产品。 Apache FreeMarker 2.2.0版本至2.3.34版本存在路径遍历漏洞，该漏洞源于模板加载机制中的路径遍历问题，当攻击者向FreeMarker指定任意畸形的locale标识符且本地化查找配置启用时，可能导致路径遍历攻击。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.85% · P58

Affected Version Matrix 4

VendorProduct Version RangeStatus
Apache Software Foundation Apache FreeMarker 2.2.0≤ 2.3.34 affected
2.3.35 unaffected
2.2.0≤ 2.3.34 affected
2.3.35 unaffected
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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
Vulnerability Title
Apache FreeMarker 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache FreeMarker是美国Apache基金会的一款服务端软件产品。 Apache FreeMarker 2.2.0版本至2.3.34版本存在路径遍历漏洞，该漏洞源于模板加载机制中的路径遍历问题，当攻击者向FreeMarker指定任意畸形的locale标识符且本地化查找配置启用时，可能导致路径遍历攻击。
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 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