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    CVE-2025-6638

    A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically affecting the MarianTokenizer's `remove_language_code()` method. This vulnerability is present in version 4.52.4 and has been fixed in version 4.53.0. The issue arises from inefficient regex processing, which can be exploited by crafted input strings containing malformed language code patterns, leading to excessive CPU consumption and potential denial of service.

    Published:Sep 12, 2025
    Last Modified:Oct 21, 2025
    EPS:Sep 12, 2025
    EPSS Score:0.00054
    CVSS Score:7.5

    Affected Products

    Vendor
    Huggingface
    Product
    Transformers

    Exploits

    https://huntr.com/bounties/6a6c933f-9ce8-4ded-8b3b-2c1444c61f36

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

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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