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    CVE-2019-14751

    NLTK Downloader before 3.4.5 is vulnerable to a directory traversal, allowing attackers to write arbitrary files via a ../ (dot dot slash) in an NLTK package (ZIP archive) that is mishandled during extraction.

    Published:Aug 22, 2019
    Last Modified:Nov 21, 2024
    EPS:Aug 22, 2019
    EPSS Score:0.03222
    CVSS Score:7.5

    Affected Products

    Vendor
    Nltk
    Product
    Nltk

    Exploits

    https://github.com/mssalvatore/CVE-2019-14751_PoChttps://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/https://github.com/mssalvatore/CVE-2019-14751_PoChttps://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/https://github.com/mssalvatore/CVE-2019-14751_PoC

    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…

    References

    http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00054.html
    http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00001.html
    https://github.com/mssalvatore/CVE-2019-14751_PoC
    https://github.com/nltk/nltk/blob/3.4.5/ChangeLog
    https://github.com/nltk/nltk/commit/f59d7ed8df2e0e957f7f247fe218032abdbe9a10
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE/
    https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/
    http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00054.html
    http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00001.html
    https://github.com/mssalvatore/CVE-2019-14751_PoC
    https://github.com/nltk/nltk/blob/3.4.5/ChangeLog
    https://github.com/nltk/nltk/commit/f59d7ed8df2e0e957f7f247fe218032abdbe9a10
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QI4IJGLZQ5S7C5LNRNROHAO2P526XE3D/
    https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZGZSSEJH7RHH3RBUEVWWYT75QU67J7SE/
    https://salvatoresecurity.com/zip-slip-in-nltk-cve-2019-14751/

    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