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    CVE-2026-56855

    Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

    Published:Sep 2, 2026
    Last Modified:Sep 4, 2026
    EPS:Sep 2, 2026
    EPSS Score:0.00384
    CVSS Score:7.5

    Affected Products

    Vendor
    Golang
    Product
    Crypto

    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