Vulnerability Details CVE-2026-65915
NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 28.8%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-65915
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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
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cpe:2.3:a:nltk:nltk:3.9.3
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cpe:2.3:a:nltk:nltk:3.9.4