pypi package report

Is waitress safe?

10 known vulnerabilities, worst severity CRITICAL.

// reach

1 direct dependencies

none carry a known advisory

    37 packages depend on it

    an advisory here reaches each of them

    Create a free accountfor every dependency path, dependent and what to upgrade
    // ai model usage

    No published models are known to use this package.

    cvss
    9.1
    critical

    CVSS v3.1 base score out of 10

    epss
    0.49%
    medium

    chance of exploitation in 30 days, 42nd percentile of all CVEs

    xyz score
    5.0
    medium

    CyberXYZ composite out of 10

    fig. 01 — GHSA-9298-4cf8-g4wj, the advisory selected below

    // 10 advisories

    GHSA-9298-4cf8-g4wj

    CRITICALGitHub ratingCVE-2024-49768
    // impact

    A remote client may send a request that is exactly recv_bytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining.

    When request lookahead is disabled (default) we won't read any more requests, and when the first request fails due to a parsing error, we simply close the connection.

    However when request lookahead is enabled, it is possible to process and receive the first request, start sending the error message back to the client while we read the next request and queue it. This will allow the secondary request to be serviced by the worker thread while the connection should be closed.

    // patches

    Waitress 3.0.1 fixes the race condition.

    // workarounds

    Disable channel_request_lookahead, this is set to 0 by default disabling this feature. For this vulnerability this value is required to be changed from the default.

    // for more information

    If you have any questions or comments about this advisory:

    • Open an issue in https://github.com/Pylons/waitress/issues (if not sensitive or security related)
    • email the Pylons Security mailing list: [pylons-project-security@googlegroups.com](mailto:pylons-project-security@googlegroups.com) (if security related)
    // thanks
    • m4yfly and urn1ce From TianGong Team of Legendsec at Qi'anxin Group.
    // cvss v3.1 vector

    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

    Attack vector
    Network
    Attack complexity
    Low
    Privileges required
    None
    User interaction
    None
    Scope
    Unchanged
    Confidentiality
    High
    Integrity
    High
    Availability
    None

    Checked 2026-11-06 at 22:26 UTC. The most recent advisory here was published 2024-10-29. Updated continuously from NVD, GHSA, OSV and CNA feeds.

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