ECHO-5640-40fe-97dc

    Dashboard / Vulnerabilities / ECHO-5640-40fe-97dc

    ECHO-5640-40fe-97dc

    Published: 1 Nov 2026Last Modified: 5 Nov 2026

    Summary: GHSA-2g37-3h88-55hc: WebSocketServerExtensionHandler's per-connection queue of negotiated extensions grows without bound with pipelined requests. Upstream's fix (https://github.com/netty/netty/commit/3574f7ed7a, 4.1.138.Final) caps that queue, which was introduced in 4.1.88.Final (https://github.com/netty/netty/commit/f761ab5620, #13180). 4.1.74.Final has no queue there: the handler keeps a single List<WebSocketServerExtension> field that each new upgrade request overwrites, so it cannot grow per request.

    Details:

    References: https://advisory.echohq.com/cve/CVE-2026-100658, https://github.com/netty/netty/security/advisories/GHSA-2g37-3h88-55hc, https://nvd.nist.gov/vuln/detail/CVE-2026-100658, https://www.vulncheck.com/advisories/netty-before-4.1.138-final-denial-of-service-via-websocketserverextensionhandler, https://github.com/advisories/GHSA-7fpc-p5rc-xwr5

    Affected packages

    Package

    Name: io.netty:netty-codec-http

    Purl: pkg:maven/io.netty/netty-codec-http

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.1.74.Final+echo.6

    Affected versions

    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