CVE catalog

CVE-2026-34763

Rack is a modular Ruby web server interface. Prior to…

[CVE catalog]

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

Severity
Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.24% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence
Original provider fields
{
  "package_releases": [
    {
      "name": "ruby-rack",
      "status": "fixed",
      "release": "sid",
      "version": "3.2.7-1"
    },
    {
      "name": "ruby-rack",
      "status": "fixed",
      "release": "forky",
      "version": "3.2.7-1"
    },
    {
      "name": "ruby-rack",
      "status": "vulnerable",
      "release": "trixie",
      "version": "3.1.20-0+deb13u1"
    },
    {
      "name": "ruby-rack",
      "status": "fixed",
      "release": "trixie-security",
      "version": "3.1.20-0+deb13u2"
    },
    {
      "name": "ruby-rack",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "2.2.22-0+deb12u1"
    },
    {
      "name": "ruby-rack",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "2.2.22-0+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "ruby-rack",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "3.2.6-2"
    },
    {
      "bug": null,
      "name": "ruby-rack",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "3.2.6-2"
    },
    {
      "bug": null,
      "name": "ruby-rack",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "3.1.20-0+deb13u2"
    },
    {
      "bug": null,
      "name": "ruby-rack",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "2.2.22-0+deb12u2"
    }
  ],
  "distribution_packages": [
    {
      "name": "ruby-rack",
      "ecosystem": "cpe",
      "fixed_version": "2.2.7-1ubuntu0.7"
    },
    {
      "name": "ruby-rack",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "rack",
      "ecosystem": "cpe",
      "fixed_version": "2.2.23"
    },
    {
      "name": "rack",
      "ecosystem": "cpe",
      "fixed_version": "3.1.21"
    },
    {
      "name": "rack",
      "ecosystem": "cpe",
      "fixed_version": "3.2.6"
    },
    {
      "name": "ruby-rack",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.4-5ubuntu1.2+esm3"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.1.4-3",
        "2.1.4-4",
        "2.1.4-5",
        "2.1.4-5ubuntu1",
        "2.1.4-5ubuntu1+esm2",
        "2.1.4-5ubuntu1+esm3",
        "2.1.4-5ubuntu1+esm4",
        "2.1.4-5ubuntu1+esm5",
        "2.1.4-5ubuntu1.1",
        "2.1.4-5ubuntu1.1+esm1",
        "2.1.4-5ubuntu1.1+esm2",
        "2.1.4-5ubuntu1.2",
        "2.1.4-5ubuntu1.2+esm1",
        "2.1.4-5ubuntu1.2+esm2"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.1.4-5ubuntu1.2+esm3",
      "provider_record_id": "UBUNTU-CVE-2026-34763"
    },
    {
      "name": "ruby-rack",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.7-1ubuntu0.7"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "2.2.4-3",
        "2.2.7-1",
        "2.2.7-1ubuntu0.1",
        "2.2.7-1ubuntu0.2",
        "2.2.7-1ubuntu0.3",
        "2.2.7-1ubuntu0.4",
        "2.2.7-1ubuntu0.5",
        "2.2.7-1ubuntu0.6"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.2.7-1ubuntu0.7",
      "provider_record_id": "UBUNTU-CVE-2026-34763"
    },
    {
      "name": "ruby-rack",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.16-0.1ubuntu0.3"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "2.2.7-1.1",
        "3.1.16-0.1",
        "3.1.16-0.1ubuntu0.1",
        "3.1.16-0.1ubuntu0.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.1.16-0.1ubuntu0.3",
      "provider_record_id": "UBUNTU-CVE-2026-34763"
    },
    {
      "name": "ruby-rack",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "3.1.16-0.1",
        "3.1.18-1",
        "3.1.18-1build1",
        "3.2.4-1ubuntu1"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-34763"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [ruby-rack]Unknown
    Details (4)

    • 2.2.22-0+deb12u1 · all · bookworm

      Affected · Fixed: 2.2.22-0+deb12u2

      nvd · ruby-rack · debian · bookworm; nvd · ruby-rack · debian · 12

    • 2.2.22-0+deb12u1 · all · bookworm

      Affected · Fixed: 2.2.22-0+deb12u2

      nvd · ruby-rack · debian · bookworm; nvd · ruby-rack · debian · 12

    • 2.2.22-0+deb12u2 · all · bookworm-security

      Fixed · Fixed: 2.2.22-0+deb12u2

      nvd · ruby-rack · debian · bookworm; nvd · ruby-rack · debian · 12

    • 2.2.22-0+deb12u2 · all · bookworm-security

      Fixed · Fixed: 2.2.22-0+deb12u2

      nvd · ruby-rack · debian · bookworm; nvd · ruby-rack · debian · 12

[Debian 13 (Trixie)]

  • [ruby-rack]Unknown
    Details (5)

    • 3.1.20-0+deb13u1 · all · trixie

      Affected · Fixed: 3.1.20-0+deb13u2

      nvd · ruby-rack · debian · 13

    • 3.1.20-0+deb13u1 · all · trixie

      Affected · Fixed: 3.1.20-0+deb13u2

      nvd · ruby-rack · debian · 13

    • 3.1.20-0+deb13u1 · all · trixie-security

      Affected · Fixed: 3.1.20-0+deb13u2

      nvd · ruby-rack · debian · 13

    • 3.1.20-0+deb13u1 · all · trixie-security · Historical version

      Affected · Fixed: 3.1.20-0+deb13u2

      nvd · ruby-rack · debian · 13

    • 3.1.20-0+deb13u2 · all · trixie-security

      Fixed · Fixed: 3.1.20-0+deb13u2

      nvd · ruby-rack · debian · 13

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]