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    CVE-2024-21503

    Versions of the package black before 24.3.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via the lines_with_leading_tabs_expanded function in the strings.py file. An attacker could exploit this vulnerability by crafting a malicious input that causes a denial of service. Exploiting this vulnerability is possible when running Black on untrusted input, or if you habitually put thousands of leading tab characters in your docstrings.

    Published:Mar 19, 2024
    Last Modified:Apr 15, 2026
    EPS:Mar 19, 2024
    EPSS Score:0.00081
    CVSS Score:5.3

    Affected Products

    Vendor
    Python Software Foundation
    Product
    Black
    Vendor
    Redhat
    Product
    Ansible Automation Platform

    Exploits

    No exploit reference

    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