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Advisory record · GHSA-7p94-766c-hgjp

NLTK has a Zip Slip Vulnerability

CVSS 10.0 CriticalCriticalEPSS 0.010 · 63rd percentile

Critical, because:

  • CVSS score 10.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 18 Feb 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nltkPyPI<3.9.33.9.3
Identifiers
GHSA-7p94-766c-hgjp · CVE-2025-14009 · PYSEC-2026-96
Weakness (CWE)
CWE-94
Tags
Published
18 Feb 2026
Updated
10 Sept 2026

Machine-written summary

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

The nltk package, versions before 3.9.3, extracts downloaded zip packages without validating their file paths. An attacker who supplies a malicious package that NLTK downloads and extracts can execute arbitrary code, including through Python files that run on import. Upgrade to nltk 3.9.3 or later.

Written 5 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
10.0 Critical 3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (@huntr_ai)
  • CISA KEV Not listed.
  • EPSS 0.010, the 63rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:34 UTC First seen by agentprime
  2. 31 Oct 2026, 14:34 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.