PYSEC-2026-3729

En bref

Publiée: 2026-08-22 15:16 UTC
Mise à jour: 2026-10-16 10:56 UTC
CVE: CVE-2026-12259, CVE-2026-63310
Alias: GHSA-5wp5-5229-5g6q, GHSA-gf32-cmjh-8m9v, PYSEC-2026-4318
CVSS_V3: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

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.

Paquets affectés

Paquet	Versions
PyPI · nltk	introduced 0, fixed 3.9.3

Références

https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification ADVISORY
https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q EVIDENCE
https://github.com/advisories/GHSA-5wp5-5229-5g6q ADVISORY

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — PyPA Advisory Database