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Apache FreeMarker CVE-2026-84939

| EUVDEUVD-2026-75251 CRITICAL
Relative Path Traversal (CWE-23)
2026-09-08 GHSA-27j2-h3m2-8237
Apache Java Path Traversal Freemarker
9.1
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
7.5 HIGH

Remotely supplied malformed locale needs no auth or interaction (AV:N/AC:L/PR:N/UI:N); it discloses template/file contents (C:H) but describes no write/modify primitive, so I:N and A:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

5
Analysis Updated
Sep 10, 2026 - 16:31 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 10, 2026 - 16:22 vuln.today
cvss_changed
CVSS changed
Sep 10, 2026 - 16:22 NVD
9.1 (CRITICAL)
Analysis Generated
Sep 08, 2026 - 16:21 vuln.today
CVE Published
Sep 08, 2026 - 15:27 oss-security
CRITICAL

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

Articles & Coverage 1

News Critical Path Traversal in Apache FreeMarker Template Engine - CVE-2026-84939 Sep 08, 2026

AnalysisAI

Path traversal in Apache FreeMarker's template loading (versions 2.2.0 through 2.3.34) lets remote attackers who can influence the locale identifier passed to FreeMarker read templates outside the intended path when the default-enabled localized lookup feature is active. The actual reach is bounded by the configured TemplateLoader - FileTemplateLoader still blocks escape from its baseDir, while classloader- or servlet-context-backed loaders are limited to resources those mechanisms can reach. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Two concrete prerequisites, both stated in the advisory: (1) the attacker must be able to supply an arbitrary, malformed locale identifier to FreeMarker (e.g. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/C:H/I:H/A:N, 9.1) rates this critical, but the signals are mixed: EPSS is only 0.21% (11th percentile), there is no known POC and no KEV listing, and the vendor advisory explicitly notes that TemplateLoader constraints substantially limit what can be reached - FileTemplateLoader, the common file-based default, is not exploitable for out-of-baseDir traversal at all. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Apache FreeMarker 2.3.35, which resolves the traversal in the localized lookup path. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all systems and applications using Apache FreeMarker and document their installed versions, prioritizing versions 2.2.0 through 2.3.34. …

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CVE-2026-84939 vulnerability details – vuln.today
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