Open-source package vulnerability · PyPI

CVE-2026-63310: Duplicate Advisory: NLTK: Missing Post-Download Integrity Verification Allows Malicious Package Injection

criticalCVSS 4.0 9.3 · 3.1 7.1GHSA-gf32-cmjh-8m9v

This advisory was withdrawn on Sep 9, 2026. The publisher no longer considers it a valid vulnerability.

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-5wp5-5229-5g6q. This link is maintained to preserve external references. Original Description NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module.

Published Aug 22, 2026 · Updated Sep 9, 2026

Affected packages

nltk

Ecosystem: PyPI
Affected: <= 3.9.2
Fixed in: No patched version yet
Check: pip show nltk

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-5wp5-5229-5g6q. This link is maintained to preserve external references.

Original Description

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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