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Advisory record · GHSA-8mgp-746c-j5xp

NLTK: Model-artifact APIs bypass pathsec and touch files outside allowed roots

CVSS 8.3 HighEPSS 0.0034 · 27th percentile

Published by the GitHub Advisory Database at 2 Sept 2026, 14:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nltkPyPI<3.10.43.10.4
Identifiers
GHSA-8mgp-746c-j5xp · CVE-2026-81726 · PYSEC-2026-3740
Weakness (CWE)
CWE-22 · CWE-59 · CWE-73
Tags
Published
2 Sept 2026
Updated
2 Nov 2026

Machine-written summary

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

NLTK before 3.10.4 has model import and export APIs that open file paths without pathsec checks. An attacker who can choose model paths in an application that relies on pathsec can read or overwrite files outside the allowed roots. Upgrade to NLTK 3.10.4.

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
8.3 High 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0034, the 27th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 2 Sept 2026, 14:35 UTC Confirmed by GitHub Advisory Database
  2. 31 Oct 2026, 14:38 UTC First seen by agentprime
  3. 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.