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Advisory record · GHSA-x5ph-mj9p-rfr8

NLTK: StreamBackedCorpusView Bypasses pathsec.ENFORCE - Arbitrary Local File Read

CVSS 8.7 HighEPSS 0.0065 · 51st percentile

Published by the GitHub Advisory Database at 8 Sept 2026, 15:27 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nltkPyPI<3.10.03.10.0
Identifiers
GHSA-x5ph-mj9p-rfr8 · CVE-2026-63312 · PYSEC-2026-3730
Weakness (CWE)
CWE-22
Tags
Published
8 Sept 2026
Updated
8 Sept 2026

Machine-written summary

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

NLTK versions before 3.10.0 are affected. Setting nltk.pathsec.ENFORCE = True does not block StreamBackedCorpusView from opening files, so an attacker who can influence the fileid argument passed to corpus readers can read arbitrary local files regardless of that setting. Upgrade to NLTK 3.10.0 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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0065, the 51st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:38 UTC First seen by agentprime
  2. 31 Oct 2026, 14:38 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.