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DEBIAN-CVE-2026-34785

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::Static determines whether a request should be served as a static file using a simple string prefix check. When configured with URL prefixes such as "/css", it matches any request path that begins with that string, including unrelated paths such as "/css-config.env" or "/css-backup.sql". As a result, files under the static root whose names merely share the configured prefix may be served unintentionally, leading to information disclosure. 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-2026-34785

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-2026-34785

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-2026-34785.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-2026-34785.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-2026-34785.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57551 · Revision 1
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Publisher date
Read the original announcement