GHSA-q6cp-qfwq-4gcv

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    GHSA-q6cp-qfwq-4gcv

    Published: 5 Apr 2024Last Modified: 10 Sept 2026

    Summary: h2 servers vulnerable to degradation of service with CONTINUATION Flood

    Details: An attacker can send a flood of CONTINUATION frames, causing `h2` to process them indefinitely. This results in an increase in CPU usage. Tokio task budget helps prevent this from a complete denial-of-service, as the server can still respond to legitimate requests, albeit with increased latency. More details at https://seanmonstar.com/blog/hyper-http2-continuation-flood/. Patches available for 0.4.x and 0.3.x versions.

    References: https://github.com/hyperium/h2, https://rustsec.org/advisories/RUSTSEC-2024-0332.html, https://seanmonstar.com/blog/hyper-http2-continuation-flood, https://www.kb.cert.org/vuls/id/421644

    Affected packages

    Package

    Name: h2

    Purl: pkg:cargo/h2

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -0.3.26

    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
    GHSA-q6cp-qfwq-4gcv | CVE-DB