PYSEC-2026-3728

    Dashboard / Vulnerabilities / PYSEC-2026-3728

    PYSEC-2026-3728

    Published: 22 Aug 2026Last Modified: 1 Sept 2026

    Summary:

    Details: NLTK versions before 3.10.0 contain a path traversal vulnerability in FramenetCorpusReader and NKJPCorpusReader that allows attackers to parse XML files outside the corpus root by supplying unsafe selectors or poisoned index state. Attackers can exploit frame_by_name, doc, lu, and header methods with crafted parameters to read arbitrary XML files accessible to the application.

    References: https://www.vulncheck.com/advisories/nltk-path-traversal-via-framenet-and-nkjp-readers, https://github.com/nltk/nltk/security/advisories/GHSA-568f-pv23-39p4

    Affected packages

    Package

    Name: nltk

    Purl: pkg:pypi/nltk

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.10.0

    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