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OpenAdvisories
High DSA-6048-1 5 CVEs

ruby-rack - security update

Published Nov 3, 2025 · Updated Nov 3, 2025

Fixed packages 2

ReleasePackageFixed in
Debian · 12 ruby-rack 2.2.20-0+deb12u1
Debian · 13 ruby-rack 3.1.18-1~deb13u1

Vulnerabilities 5

  • High 7.5

    Rack's unbounded multipart preamble buffering enables DoS (memory exhaustion)

    Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` buffers the entire multipart preamble (bytes before the first boundary) in memory without any size limit. A client can send a large preamble…

  • High 7.5

    Rack's multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)

    Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, ``Rack::Multipart::Parser` stores non-file form fields (parts without a `filename`) entirely in memory as Ruby `String` objects. A single large text field in a multip…

  • High 7.5

    Rack's multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)

    Rack is a modular Ruby web server interface. In versions prior to 2.2.19, 3.1.17, and 3.2.2, `Rack::Multipart::Parser` can accumulate unbounded data when a multipart part’s header block never terminates with the required blank line (`CRLFCRLF`). The parser ke…

  • High 7.5

    Rack is vulnerable to a memory-exhaustion DoS through unbounded URL-encoded body parsing

    Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, `Rack::Request#POST` reads the entire request body into memory for `Content-Type: application/x-www-form-urlencoded`, calling `rack.input.read(nil)` without enforcing a …

  • Medium 5.8

    Rack has Possible Information Disclosure Vulnerability

    Rack is a modular Ruby web server interface. Prior to versions 2.2.20, 3.1.18, and 3.2.3, a possible information disclosure vulnerability existed in `Rack::Sendfile` when running behind a proxy that supports `x-sendfile` headers (such as Nginx). Specially cra…