CVE Feed

    Dashboard / CVE / CVE-2026-56817

    CVE-2026-56817

    Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.

    Published:Jul 21, 2026
    Last Modified:Jul 27, 2026
    EPS:Jul 21, 2026
    EPSS Score:0.0032
    CVSS Score:7.5

    Affected Products

    Vendor
    Netty
    Product
    Netty

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-221 Data Serialization External Entities Blowup

    Related CVEs

    CVE-2026-89044 (CVSS 6.9) — Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly vali…
    CVE-2026-76816 (CVSS 3.5) — Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.…
    CVE-2026-62380 (CVSS 6.3) — Netty (io.netty:netty-codec-socks) versions 4.2.0.Final through 4.2.16.Final and 4.1.x through 4.1.136.Final c…
    CVE-2026-62243 (CVSS 8.7) — Netty (io.netty:netty-handler) versions from 4.2.0.Final through 4.2.16.Final and versions through 4.1.136.Fin…
    CVE-2026-75595 (CVSS 9.1) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, …
    CVE-2026-75596 (CVSS 8.7) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final,…
    CVE-2026-59903 (CVSS 6.5) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final,…
    CVE-2026-59902 (CVSS 7.5) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final,…
    CVE-2026-73508 (CVSS 5.3) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final,…
    CVE-2026-73507 (CVSS 7.5) — Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final,…

    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