CVE-2026-63310

Critical

Open

TLP:CLEAR

NLTK before 3.9.3 Missing Post-Download Integrity Verification

NVD CVE.org

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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.

Details

CVSS Score: 9.3
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 22, 2026
Last Modified: Aug 22, 2026

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