CVE-2022-21698

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    CVE-2022-21698

    Published: 15 Feb 2022Last Modified: 14 Sept 2026

    Summary: Uncontrolled Resource Consumption in promhttp

    Details: client_golang is the instrumentation library for Go applications in Prometheus, and the promhttp package in client_golang provides tooling around HTTP servers and clients. In client_golang prior to version 1.11.1, HTTP server is susceptible to a Denial of Service through unbounded cardinality, and potential memory exhaustion, when handling requests with non-standard HTTP methods. In order to be affected, an instrumented software must use any of `promhttp.InstrumentHandler*` middleware except `RequestsInFlight`; not filter any specific methods (e.g GET) before middleware; pass metric with `method` label name to our middleware; and not have any firewall/LB/proxy that filters away requests with unknown `method`. client_golang version 1.11.1 contains a patch for this issue. Several workarounds are available, including removing the `method` label name from counter/gauge used in the InstrumentHandler; turning off affected promhttp handlers; adding custom middleware before promhttp handler that will sanitize the request method given by Go http.Request; and using a reverse proxy or web application firewall, configured to only allow a limited set of methods.

    References: https://github.com/prometheus/client_golang/releases/tag/v1.11.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21698.json, https://github.com/prometheus/client_golang/security/advisories/GHSA-cg3q-j54f-5p7p, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2IK53GWZ475OQ6ENABKMJMTOBZG6LXUR/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2PFW6Q2LXXWTFRTMTRN4ZGADFRQPKJ3D/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36GUEPA5TPSC57DZTPYPBL6T7UPQ2FRH/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3L6GDN5S5QZSCFKWD3GKL2RDZQ6B4UWA/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4KDETHL5XCT6RZN2BBNOCEXRZ2W3SFU3/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5OGNAFVXSMTTT2UPH6CS3IH6L3KM42Q7/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7V7I72LSQ3IET3QJR6QPAVGJZ4CBDLN5/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AK7CJBCGERCRXYUR2EWDSSDVAQMTAZGX/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLUJZV3HBP56ADXU6QH2V7RNYUPMVBXQ/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FY3N7H6VSDZM37B4SKM2PFFCUWU7QYWN/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HLAQRRGNSO5MYCPAXGPH2OCSHOGHSQMQ/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J5WPM42UR6XIBQNQPNQHM32X7S4LJTRX/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KBMVIQFKQDSSTHVVJWJ4QH6TW3JVB7XZ/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MH6ALXEQXIFQRQFNJ5Y2MJ5DFPIX76VN/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RN7JGC2LVHPEGSJYODFUV5FEKPBVG4D7/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SASRKYHT5ZFSVMJUQUG3UAEQRJYGJKAR/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKORFJTRRDJCWBTJPISKKCVMMMJBIRLG/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZY2SLWOQR4ZURQ7UBRZ7JIX6H6F5JHJR/, https://nvd.nist.gov/vuln/detail/CVE-2022-21698, https://github.com/prometheus/client_golang/pull/962, https://github.com/prometheus/client_golang/pull/987

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -989baa30fe956631907493ccee1f8e7708660d96

    Affected versions

    v1.11.0

    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-2022-21698 | CVE-DB