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Advisory record · GHSA-fg7f-2386-8897

Natural Language Toolkit (NLTK): ReDoS in NLTK ReviewsCorpusReader FEATURES regex

CVSS 7.5 High

Published by the GitHub Advisory Database at 31 Jul 2026, 16:51 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-fg7f-2386-8897 · CVE-2026-12061 · PYSEC-2026-3582
Weakness (CWE)
CWE-1333
Tags
Published
31 Jul 2026
Updated
10 Sept 2026

Machine-written summary

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

Natural Language Toolkit (NLTK) versions before 3.10.0 are vulnerable to a regular expression denial of service in the ReviewsCorpusReader FEATURES regex. An attacker who can supply a reviews corpus, such as through a service or pipeline that loads untrusted input, can submit one long line without bracketed annotations to cause quadratic CPU consumption that hangs processing. Upgrade to NLTK 3.10.0 or later.

Written 4 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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:29 UTC First seen by agentprime
  2. 31 Oct 2026, 14:29 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.