PYSEC-2026-3732

    Dashboard / Vulnerabilities / PYSEC-2026-3732

    PYSEC-2026-3732

    Published: 22 Aug 2026Last Modified: 1 Sept 2026

    Summary:

    Details: NLTK versions before 3.9.4 contain a symlink escape vulnerability in CorpusReader.open() that allows local attackers to read arbitrary files outside the corpus root. The vulnerability exists because path validation is lexical and does not account for symlink resolution, enabling attackers to place symlinks inside the corpus root to access files outside the intended boundary.

    References: https://www.vulncheck.com/advisories/nltk-before-symlink-escape-via-corpusreader, https://github.com/nltk/nltk/security/advisories/GHSA-r6gq-whwq-mvg9

    Affected packages

    Package

    Name: nltk

    Purl: pkg:pypi/nltk

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.9.4

    Affected versions

    0.8

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    PYSEC-2026-3732 | CVE-DB