CVE Feed

    Dashboard / CVE / CVE-2026-33236

    CVE-2026-33236

    NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.

    Published:Mar 20, 2026
    Last Modified:Mar 25, 2026
    EPS:Mar 20, 2026
    EPSS Score:0.0004
    CVSS Score:8.1

    Affected Products

    Vendor
    Nltk
    Product
    Nltk

    Exploits

    https://github.com/nltk/nltk/security/advisories/GHSA-469j-vmhf-r6v7

    Related CVEs

    CVE-2026-81727 (CVSS 6.9) — NLTK versions before 3.10.3 contain a filesystem containment bypass vulnerability in the Downloader.download a…
    CVE-2026-81725 (CVSS 6.3) — NLTK before 3.10.3 contains a regular expression denial of service vulnerability in Pl196xCorpusReader that al…
    CVE-2026-81726 (CVSS 8.3) — NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforce…
    CVE-2026-81724 (CVSS 6.9) — NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that a…
    CVE-2026-81723 (CVSS 6.3) — NLTK versions before 3.10.3 contain a quadratic CPU exhaustion vulnerability in XMLCorpusView._read_xml_fragme…
    CVE-2026-81722 (CVSS 8.7) — nltk PorterStemmer in versions <= 3.10.2 (fixed in 3.10.3) contains an inefficient-algorithmic-complexity deni…
    CVE-2026-80206 (CVSS 8.2) — NLTK before 3.10.3 contains a regular expression denial of service (ReDoS) vulnerability in the tgrep module. …
    CVE-2026-80205 (CVSS 8.7) — NLTK versions before 3.10.0 contain a regular expression denial of service vulnerability in Text.findall() and…
    CVE-2026-79676 (CVSS 8.2) — NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived …
    CVE-2026-79674 (CVSS 8.8) — NLTK versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors that all…

    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