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    CVE-2026-42583

    Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

    Published:May 13, 2026
    Last Modified:May 18, 2026
    EPS:May 13, 2026
    EPSS Score:0.0004
    CVSS Score:7.5

    Affected Products

    Vendor
    Io.netty
    Product
    Netty-codec
    Vendor
    Io.netty
    Product
    Netty-codec-compression
    Vendor
    Netty
    Product
    Netty

    Exploits

    https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6

    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