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    CVE-2026-97031

    Multiple ECH outer extension references are not permitted under RFC 9849; previously, a client could send a well-crafted packet that could trigger memory exhaustion in the server process by specifying multiple references. We now reject these as malformed and curb the memory amplification vector as a result.

    Published:Oct 8, 2026
    Last Modified:Oct 9, 2026
    EPS:Oct 8, 2026
    EPSS Score:0.00179
    CVSS Score:7.5

    Affected Products

    Vendor
    Go Standard Library
    Product
    Crypto Tls

    Exploits

    No exploit reference

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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