Apache FreeMarker, Apache FreeMarker: A malformed locale may be exploitable for path traversal attacks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84939
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-10 06:17:06 UTC
Updated2026-09-10 06:17:06 UTC
DescriptionPath 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.

Risk And Classification

Problem Types: CWE-23 | CWE-23 CWE-23 Relative path traversal

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache FreeMarker affected 2.2.0 2.3.34 semver Not specified
CNA Apache Software Foundation Apache FreeMarker unaffected 2.3.35 semver Not specified
CNA Apache Software Foundation Apache FreeMarker affected 2.2.0 2.3.34 semver Not specified
CNA Apache Software Foundation Apache FreeMarker unaffected 2.3.35 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread/hrd7o2ylwkkswdyhyzllgqt0f80kyd5y [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/09/08/2 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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