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    CVE-2026-81726

    NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.

    Published:Aug 27, 2026
    Last Modified:Aug 31, 2026
    EPS:Aug 27, 2026
    EPSS Score:0.0026
    CVSS Score:7

    Affected Products

    Vendor
    Nltk
    Product
    Nltk

    Exploits

    https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xphttps://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp

    Related CVEs

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    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…
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    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