CVE-2026-19204

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    CVE-2026-19204

    Published: 7 Sept 2026Last Modified: 10 Sept 2026

    Summary:

    Details: A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap. This occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/19xxx/CVE-2026-19204.json, https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g, https://nvd.nist.gov/vuln/detail/CVE-2026-19204

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- c8372b65bd15404de1444d68902c0455a3a69b64
    Fixed -None

    Affected versions

    jetty-12.1.11
    jetty-12.1.5
    jetty-12.1.4
    jetty-12.1.2
    jetty-12.1.0.beta1

    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
    CVE-2026-19204 | CVE-DB