Description
NLTK through 3.10.3 contains a path traversal vulnerability in WekaClassifier that allows attackers to bypass nltk.pathsec containment by supplying unvalidated model paths. Attackers controlling the model_filename or model argument can make the weka JVM write files via -d or probe files via -l outside allowed data roots.
Published: 2026-10-13
Score: 8.3 High
EPSS: < 1% Very Low
KEV: No
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Remediation

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Tracking

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History

Mon, 26 Oct 2026 21:30:00 +0100

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 14 Oct 2026 02:30:00 +0200

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 13 Oct 2026 15:45:00 +0200

Type Values Removed Values Added
Description NLTK through 3.10.3 contains a path traversal vulnerability in WekaClassifier that allows attackers to bypass nltk.pathsec containment by supplying unvalidated model paths. Attackers controlling the model_filename or model argument can make the weka JVM write files via -d or probe files via -l outside allowed data roots.
Title NLTK through 3.10.3 Path Traversal via WekaClassifier Model Path
First Time appeared Nltk
Nltk nltk
Weaknesses CWE-22
CPEs cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*
Vendors & Products Nltk
Nltk nltk
References
Metrics cvssV3_1

{'score': 7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L'}

cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T19:46:30.241Z

Reserved: 2026-10-13T11:25:25.214Z

Link: CVE-2026-109956

cve-icon Vulnrichment

Updated: 2026-10-26T19:46:06.747Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-13T14:17:34.520

Modified: 2026-10-26T20:17:47.480

Link: CVE-2026-109956

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-13T13:27:20Z

Links: CVE-2026-109956 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T17:30:08Z

Weaknesses
  • CWE-22

    Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')