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Advisory record · GHSA-vp2x-qp44-57v7

NLTK: Quadratic CPU Exhaustion in `XMLCorpusView._read_xml_fragment()`

CVSS 6.3 MediumEPSS 0.0028 · 20th percentile

Published by the GitHub Advisory Database at 2 Sept 2026, 14:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
nltkPyPI<3.10.33.10.3
Identifiers
GHSA-vp2x-qp44-57v7 · CVE-2026-81723 · PYSEC-2026-3871
Weakness (CWE)
CWE-400 · CWE-407
Tags
Published
2 Sept 2026
Updated
10 Sept 2026

Machine-written summary

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

NLTK versions before 3.10.3 are vulnerable to CPU exhaustion when reading XML corpus files through XMLCorpusView and its dependent readers. An attacker who can write a malformed XML file to a path the reader opens can trigger quadratic CPU use, causing denial of service. Upgrade to NLTK 3.10.3 or later.

Written 1 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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0028, the 20th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:10 UTC First seen by agentprime
  2. 31 Oct 2026, 14:10 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.