GHSA-c2f4-cvqm-65w2

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    GHSA-c2f4-cvqm-65w2

    Published: 8 Jan 2024Last Modified: 10 Sept 2026

    Summary: Puma HTTP Request/Response Smuggling vulnerability

    Details: ### Impact Prior to versions 6.4.2 and 5.6.8, puma exhibited dangerous behavior when parsing chunked transfer encoding bodies. Fixed versions limit the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption. ### Patches The vulnerability has been fixed in 6.4.2 and 5.6.8. ### Workarounds No known workarounds. ### References * [HTTP Request Smuggling](https://portswigger.net/web-security/request-smuggling) * Open an issue in [Puma](https://github.com/puma/puma) * See our [security policy](https://github.com/puma/puma/security/policy)

    References: https://github.com/puma/puma/security/advisories/GHSA-c2f4-cvqm-65w2, https://nvd.nist.gov/vuln/detail/CVE-2024-21647, https://github.com/puma/puma/commit/5fc43d73b6ff193325e657a24ed76dec79133e93, https://github.com/puma/puma/commit/60d5ee3734adc8cee85c3f0561af392448fe19b7, https://github.com/puma/puma/commit/bbb880ffb6debbfdea535b4b3eb2204d49ae151d, https://github.com/puma/puma, https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2024-21647.yml, https://lists.debian.org/debian-lts-announce/2024/11/msg00004.html

    Affected packages

    Package

    Name: puma

    Purl: pkg:gem/puma

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 6.0.0
    Fixed -6.4.2

    Affected versions

    6.0.0
    6.0.1
    6.0.2

    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-c2f4-cvqm-65w2 | CVE-DB