GHSA-27j2-h3m2-8237

Source

https://github.com/advisories/GHSA-27j2-h3m2-8237

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-27j2-h3m2-8237/GHSA-27j2-h3m2-8237.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-27j2-h3m2-8237

Aliases

CVE-2026-84939

Published

2026-09-10T06:31:45Z

Modified

2026-09-24T19:15:05Z

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

Apache FreeMarker template loading mechanism vulnerable to path traversal

Details

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.

Database specific

{
    "cwe_ids":  [
        "CWE-23"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-24T19:08:23Z",
    "nvd_published_at":  "2026-09-10T06:17:06Z",
    "severity":  "CRITICAL"
}

References

Affected packages

Maven / org.freemarker:freemarker

Package

Name: org.freemarker:freemarker; View open source insights on deps.dev
Purl: pkg:maven/org.freemarker/freemarker

Affected ranges

Type: ECOSYSTEM
Events: Introduced

2.2.0

Fixed

2.3.35

Affected versions

2.*

2.3.9

2.3.10

2.3.11

2.3.12

2.3.13

2.3.14

2.3.15

2.3.16

2.3.17

2.3.18

2.3.19

2.3.20

2.3.21

2.3.22

2.3.23

2.3.24-incubating

2.3.25-incubating

2.3.26-incubating

2.3.27-incubating

2.3.28

2.3.29

2.3.30

2.3.31

2.3.32

2.3.33

2.3.34

Database specific

last_known_affected_version_range

"<= 2.3.34"

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-27j2-h3m2-8237/GHSA-27j2-h3m2-8237.json"