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.
Published: 2026-08-22
Score: 9.3 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sat, 22 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title NLTK before 3.9.3 Missing Post-Download Integrity Verification
First Time appeared Nltk
Nltk nltk
Weaknesses CWE-494
CPEs cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*
Vendors & Products Nltk
Nltk nltk
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:H'}

cvssV4_0

{'score': 9.3, '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'}

Subscriptions

Nltk Nltk
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-22T14:12:39.360Z

Reserved: 2026-07-16T12:13:18.733Z

Link: CVE-2026-63310

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-22T15:16:19.100

Modified: 2026-08-22T15:16:19.100

Link: CVE-2026-63310

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-22T15:30:05Z

Weaknesses