---
title: "CVE-2026-84939: Apache FreeMarker - Path Traversal"
description: "Apache FreeMarker 2.2.0 through 2.3.34 contains a path traversal caused by specifying a malformed locale identifier with localized lookup enabled, letting attackers access unintended template files, exploit requires localized lookup enabled."
url: https://panop.io/threat-heartbeat/CVE-2026-84939/
---

# CVE-2026-84939 Apache FreeMarker - Path Traversal

Apache FreeMarker 2.2.0 through 2.3.34 contains a path traversal caused by specifying a malformed locale identifier with localized lookup enabled, letting attackers access unintended template files, exploit requires localized lookup enabled.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.85% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84939)

## Details

Type

Path Traversal

Impact

File System Read, Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

10 September 2026

Updated

15 October 2026

Weakness

[CWE-23](https://cwe.mitre.org/data/definitions/23.html)

## Vendor fix

Upgrade to version 2.3.35 or disable localized lookup.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-84939](https://nvd.nist.gov/vuln/detail/CVE-2026-84939)
- [http://www.openwall.com/lists/oss-security/2026/09/08/2](http://www.openwall.com/lists/oss-security/2026/09/08/2)
- [https://lists.apache.org/thread/hrd7o2ylwkkswdyhyzllgqt0f80kyd5y](https://lists.apache.org/thread/hrd7o2ylwkkswdyhyzllgqt0f80kyd5y)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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