CVE-2023-40175

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    CVE-2023-40175

    Published: 18 Aug 2023Last Modified: 12 Aug 2026

    Summary: Inconsistent Interpretation of HTTP Requests in puma

    Details: Puma is a Ruby/Rack web server built for parallelism. Prior to versions 6.3.1 and 5.6.7, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling. Severity of this issue is highly dependent on the nature of the web site using puma is. This could be caused by either incorrect parsing of trailing fields in chunked transfer encoding bodies or by parsing of blank/zero-length Content-Length headers. Both issues have been addressed and this vulnerability has been fixed in versions 6.3.1 and 5.6.7. Users are advised to upgrade. There are no known workarounds for this vulnerability.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/40xxx/CVE-2023-40175.json, https://github.com/puma/puma/security/advisories/GHSA-68xg-gqqm-vgj8, https://nvd.nist.gov/vuln/detail/CVE-2023-40175, https://github.com/puma/puma/commit/690155e7d644b80eeef0a6094f9826ee41f1080a

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -78393bf2c58bf293860fa9cdc73938ac58c18afb

    Affected versions

    v5.6.6
    v5.6.5
    v5.6.4
    v5.6.2
    v5.6.1
    v5.6.0

    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-2023-40175 | CVE-DB