High severity7.5NVD Advisory· Published Aug 22, 2026
CVE-2026-63312
CVE-2026-63312
Description
NLTK before 3.10.0 contains an arbitrary local file read vulnerability in StreamBackedCorpusView that bypasses pathsec.ENFORCE by calling builtins.open() directly instead of pathsec.open(). Attackers who control the fileid argument can read arbitrary local files regardless of the ENFORCE setting, including sensitive system files and application credentials.
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Affected products
1Patches
Vulnerability mechanics
References
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