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    CVE-2026-123610

    rustls before 0.23.46 contains an uncontrolled memory allocation flaw in its optional Brotli certificate decompression, which limits decompressed output size but accepts an input-selected large history window. Malicious peers can send a certificate with a five-byte Brotli header requesting up to 1 GiB before authentication, aborting Brotli-enabled clients or client-authenticating servers whose allocator cannot satisfy the request.

    Published:Nov 8, 2026
    Last Modified:Nov 9, 2026
    EPS:Nov 8, 2026
    EPSS Score:0.00165
    CVSS Score:3.7

    Affected Products

    Vendor
    Rustls
    Product
    Rustls
    Vendor
    Rustls Project
    Product
    Rustls

    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