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    CVE-2020-6817

    bleach.clean behavior parsing style attributes could result in a regular expression denial of service (ReDoS). Calls to bleach.clean with an allowed tag with an allowed style attribute are vulnerable to ReDoS. For example, bleach.clean(..., attributes={'a': ['style']}).

    Published:Feb 16, 2023
    Last Modified:Mar 19, 2025
    EPS:Feb 16, 2023
    EPSS Score:0.00167
    CVSS Score:7.5

    Affected Products

    Vendor
    Mozilla
    Product
    Bleach

    Exploits

    https://bugzilla.mozilla.org/show_bug.cgi?id=1623633https://bugzilla.mozilla.org/show_bug.cgi?id=1623633

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

    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