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DEBIAN-CVE-2026-34829

Type: advisorySource: OSV1 source record

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENT_LENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size limit. For file parts, the uploaded body is written directly to a temporary file on disk rather than being constrained by the buffered in-memory upload limit. An unauthenticated attacker can therefore stream an arbitrarily large multipart file upload and consume unbounded disk space. This results in a denial of service condition for Rack applications that accept multipart form data. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-34829

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-34829

ruby-rack

Source reference: /affected/0/package/name

Affected versions
2.2.13-1~deb12u1

Source reference: /affected/0/versions

2.2.20-0+deb12u1

Source reference: /affected/0/versions

2.2.22-0+deb12u1

Source reference: /affected/0/versions

2.2.6.4-1

Source reference: /affected/0/versions

2.2.6.4-1+deb12u1

Source reference: /affected/0/versions

2.2.7-1

Source reference: /affected/0/versions

2.2.7-1.1

Source reference: /affected/0/versions

Fixed versions
2.2.22-0+deb12u2

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

ruby-rack

Source reference: /affected/1/package/name

Affected versions
3.1.16-0.1

Source reference: /affected/1/versions

3.1.18-1

Source reference: /affected/1/versions

3.1.18-1~deb13u1

Source reference: /affected/1/versions

3.1.20-0+deb13u1

Source reference: /affected/1/versions

Fixed versions
3.1.20-0+deb13u2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

ruby-rack

Source reference: /affected/2/package/name

Affected versions
3.1.16-0.1

Source reference: /affected/2/versions

3.1.18-1

Source reference: /affected/2/versions

3.1.18-1~deb13u1

Source reference: /affected/2/versions

3.2.4-1

Source reference: /affected/2/versions

3.2.5-1

Source reference: /affected/2/versions

3.2.5-2

Source reference: /affected/2/versions

3.2.6-1

Source reference: /affected/2/versions

Fixed versions
3.2.6-2

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.2.22-0+deb12u2"
          }
        ]
      }
    ],
    "package": {
      "name": "ruby-rack",
      "purl": "pkg:deb/debian/ruby-rack?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.2.13-1~deb12u1",
      "2.2.20-0+deb12u1",
      "2.2.22-0+deb12u1",
      "2.2.6.4-1",
      "2.2.6.4-1+deb12u1",
      "2.2.7-1",
      "2.2.7-1.1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34829.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.1.20-0+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "ruby-rack",
      "purl": "pkg:deb/debian/ruby-rack?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "3.1.16-0.1",
      "3.1.18-1",
      "3.1.18-1~deb13u1",
      "3.1.20-0+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34829.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.2.6-2"
          }
        ]
      }
    ],
    "package": {
      "name": "ruby-rack",
      "purl": "pkg:deb/debian/ruby-rack?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "3.1.16-0.1",
      "3.1.18-1",
      "3.1.18-1~deb13u1",
      "3.2.4-1",
      "3.2.5-1",
      "3.2.5-2",
      "3.2.6-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34829.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57544 · Revision 1
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Publisher date
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