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    CVE-2025-6998

    ReDoS in strip_whitespaces() function in cps/string_helper.py in Calibre Web and Autocaliweb allows unauthenticated remote attackers to cause denial of service via specially crafted username parameter that triggers catastrophic backtracking during login. This issue affects Calibre Web: 0.6.24 (Nicolette); Autocaliweb: from 0.7.0 before 0.7.1.

    Published:Jul 24, 2025
    Last Modified:Apr 15, 2026
    EPS:Jul 24, 2025
    EPSS Score:0.00078
    CVSS Score:8.7

    Affected Products

    Vendor
    Janeczku
    Product
    Calibre-web

    Exploits

    https://github.com/mind2hex/CVE-2025-6998-CalibreWeb-0.6.24-ReDoS

    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