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 ↗

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

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

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