CVE-2026-84939

Unintended template loading via malformed locale

Published Sep 10, 2026 · Updated Sep 10, 2026

Path traversal in Apache FreeMarker 2.2.0 through 2.3.34 allows attackers to load unintended templates via a malformed locale identifier. Localized lookup incorporates the untrusted locale while deriving candidate template names, allowing traversal syntax to influence the resource passed to the configured TemplateLoader. Exploitation requires attacker control of the locale and localized lookup, enabled by default; accessible resources remain bounded by the configured loader and its storage.

CVSS severityUnavailable
Unscored
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Apache FreeMarker 2.2.0 through 2.3.34 allows attackers to load unintended templates via a malformed locale identifier. Localized lookup incorporates the untrusted locale while deriving candidate template names, allowing traversal syntax to influence the resource passed to the configured TemplateLoader. Exploitation requires attacker control of the locale and localized lookup, enabled by default; accessible resources remain bounded by the configured loader and its storage.

The record

CVE
CVE-2026-84939
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
The Apache Software Foundation
Product
Apache FreeMarker
Classifications
CWE-23
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.2.0 <=2.3.34

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Apache Software Foundation · Apache FreeMarkerversion=2.2.0 <=2.3.34

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal

Public exploit references

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Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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