CVE-2026-33236HIGH 8.1EPSS p31.4%

CVE-2026-33236CVE-2026-33236

Description

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
EPSS0.40% probability of exploitation · percentile 31.4% · 2026-06-19T12:03:05Z
Published2026-03-20
Last modified2026-03-23

Underlying weaknesses· 1

CWE-22

References

  1. https://github.com/nltk/nltk/commit/89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a
  2. https://github.com/nltk/nltk/security/advisories/GHSA-469j-vmhf-r6v7

1

TypeTargetConfidenceTier
WeaknessImproper Limitation of a Pathname to a Restricted Directory ('Path Traversal')cwe-220%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.