Vulnerability Details CVE-2026-63310
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 1.4%
CVSS Severity
CVSS v3 Score 7.1
Products affected by CVE-2026-63310
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cpe:2.3:a:nltk:nltk:2.0.1
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cpe:2.3:a:nltk:nltk:2.0.3
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cpe:2.3:a:nltk:nltk:2.0.4
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cpe:2.3:a:nltk:nltk:3.0.0
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cpe:2.3:a:nltk:nltk:3.0.1
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cpe:2.3:a:nltk:nltk:3.0.2
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cpe:2.3:a:nltk:nltk:3.0.3
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cpe:2.3:a:nltk:nltk:3.0.4
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cpe:2.3:a:nltk:nltk:3.0.5
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cpe:2.3:a:nltk:nltk:3.2.1
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cpe:2.3:a:nltk:nltk:3.2.2
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cpe:2.3:a:nltk:nltk:3.2.3
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cpe:2.3:a:nltk:nltk:3.2.4
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cpe:2.3:a:nltk:nltk:3.2.5
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cpe:2.3:a:nltk:nltk:3.4.1
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cpe:2.3:a:nltk:nltk:3.4.3
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cpe:2.3:a:nltk:nltk:3.4.4
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cpe:2.3:a:nltk:nltk:3.4.5
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cpe:2.3:a:nltk:nltk:3.6.1
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cpe:2.3:a:nltk:nltk:3.6.2
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cpe:2.3:a:nltk:nltk:3.6.3
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cpe:2.3:a:nltk:nltk:3.6.4
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cpe:2.3:a:nltk:nltk:3.6.5
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cpe:2.3:a:nltk:nltk:3.6.6
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cpe:2.3:a:nltk:nltk:3.6.7
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cpe:2.3:a:nltk:nltk:3.8.1
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cpe:2.3:a:nltk:nltk:3.9.1
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cpe:2.3:a:nltk:nltk:3.9.2