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    CVE-2026-31814

    Yamux is a stream multiplexer over reliable, ordered connections such as TCP/IP. From 0.13.0 to before 0.13.9, a specially crafted WindowUpdate can cause arithmetic overflow in send-window accounting, which triggers a panic in the connection state machine. This is remotely reachable over a normal network connection and does not require authentication. This vulnerability is fixed in 0.13.9.

    Published:Mar 13, 2026
    Last Modified:Mar 23, 2026
    EPS:Mar 13, 2026
    EPSS Score:0.00071
    CVSS Score:7.5

    Affected Products

    Vendor
    Libp2p
    Product
    Rust-yamux
    Vendor
    Protocol
    Product
    Yamux

    Exploits

    https://github.com/libp2p/rust-yamux/security/advisories/GHSA-4w32-2493-32g7

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    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