PYSEC-2026-3737

    Dashboard / Vulnerabilities / PYSEC-2026-3737

    PYSEC-2026-3737

    Published: 25 Aug 2026Last Modified: 1 Sept 2026

    Summary:

    Details: NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open() instead of nltk.pathsec.open(), allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose outside-root content through normal corpus reader methods like channels(), domains(), and synonyms().

    References: https://www.vulncheck.com/advisories/nltk-before-path-traversal-via-symlink-bypass, https://github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr

    Affected packages

    Package

    Name: nltk

    Purl: pkg:pypi/nltk

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.10.3

    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