Vulnerabilities CVE-2026-63312

CVE-2026-63312

High

Open

TLP:CLEAR

NLTK StreamBackedCorpusView Bypasses pathsec.ENFORCE Arbitrary File Read

NVD CVE.org

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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.

Details

CVSS Score: 8.7
CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Confidence: 90%
Published: Aug 22, 2026
Last Modified: Aug 22, 2026

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