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Advisory record · GHSA-27j2-h3m2-8237

Apache FreeMarker template loading mechanism vulnerable to path traversal

CVSS 9.1 CriticalCriticalEPSS 0.0085 · 58th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 10 Sept 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.freemarker:freemarkerMaven>=2.2.0, <2.3.352.3.35
Identifiers
GHSA-27j2-h3m2-8237 · CVE-2026-84939
Weakness (CWE)
CWE-23
Tags
Published
10 Sept 2026
Updated
24 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Apache FreeMarker from 2.2.0 through 2.3.34 is vulnerable to path traversal in its template loading mechanism. An attacker who can supply a malformed locale identifier to FreeMarker can exploit this when localized lookup is enabled, which is the default. Upgrade to version 2.3.35; disabling localized lookup also mitigates the issue in earlier versions. Files remain limited by the configured TemplateLoader, so FileTemplateLoader still blocks access outside its base directory.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.0085, the 58th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.