UBUNTU-CVE-2026-34785 (CVE-2026-34785)

Vulnerability from osv_ubuntu – Published: 2026-04-02 17:16 – Updated: 2026-07-22 18:37 – Source website
VLAI
Details

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "librack-ruby",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          },
          {
            "binary_name": "librack-ruby1.8",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          },
          {
            "binary_name": "librack-ruby1.9.1",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          },
          {
            "binary_name": "ruby-rack",
            "binary_version": "1.5.2-3+deb8u3ubuntu1~esm11"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@1.5.2-3+deb8u3ubuntu1~esm11?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.2-3+deb8u3ubuntu1~esm11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.2-1",
        "1.5.2-1ubuntu0.1~esm1",
        "1.5.2-3+deb8u3ubuntu1~esm2",
        "1.5.2-3+deb8u3ubuntu1~esm3",
        "1.5.2-3+deb8u3ubuntu1~esm4",
        "1.5.2-3+deb8u3ubuntu1~esm6",
        "1.5.2-3+deb8u3ubuntu1~esm7",
        "1.5.2-3+deb8u3ubuntu1~esm8",
        "1.5.2-3+deb8u3ubuntu1~esm9",
        "1.5.2-3+deb8u3ubuntu1~esm10"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "1.6.4-3ubuntu0.2+esm10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@1.6.4-3ubuntu0.2+esm10?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6.4-3ubuntu0.2+esm10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5.2-4",
        "1.6.4-2",
        "1.6.4-3",
        "1.6.4-3ubuntu0.1",
        "1.6.4-3ubuntu0.2",
        "1.6.4-3ubuntu0.2+esm1",
        "1.6.4-3ubuntu0.2+esm2",
        "1.6.4-3ubuntu0.2+esm4",
        "1.6.4-3ubuntu0.2+esm5",
        "1.6.4-3ubuntu0.2+esm6",
        "1.6.4-3ubuntu0.2+esm7",
        "1.6.4-3ubuntu0.2+esm8",
        "1.6.4-3ubuntu0.2+esm9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "1.6.4-4ubuntu0.2+esm10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@1.6.4-4ubuntu0.2+esm10?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.6.4-4ubuntu0.2+esm10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.4-4",
        "1.6.4-4ubuntu0.1",
        "1.6.4-4ubuntu0.2",
        "1.6.4-4ubuntu0.2+esm1",
        "1.6.4-4ubuntu0.2+esm2",
        "1.6.4-4ubuntu0.2+esm4",
        "1.6.4-4ubuntu0.2+esm5",
        "1.6.4-4ubuntu0.2+esm6",
        "1.6.4-4ubuntu0.2+esm7",
        "1.6.4-4ubuntu0.2+esm8",
        "1.6.4-4ubuntu0.2+esm9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "2.1.4-5ubuntu1.2+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@2.1.4-5ubuntu1.2+esm3?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.4-5ubuntu1.2+esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "2.2.7-1ubuntu0.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@2.2.7-1ubuntu0.7?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.7-1ubuntu0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "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_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "3.1.16-0.1ubuntu0.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@3.1.16-0.1ubuntu0.3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.16-0.1ubuntu0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.7-1.1",
        "3.1.16-0.1",
        "3.1.16-0.1ubuntu0.1",
        "3.1.16-0.1ubuntu0.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-rack",
            "binary_version": "3.2.4-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ruby-rack",
        "purl": "pkg:deb/ubuntu/ruby-rack@3.2.4-1ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.16-0.1",
        "3.1.18-1",
        "3.1.18-1build1",
        "3.2.4-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2026-34785",
  "modified": "2026-07-22T18:37:15Z",
  "published": "2026-04-02T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-34785"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-34785"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rack/rack/security/advisories/GHSA-h2jq-g4cq-5ppq"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8182-1"
    }
  ],
  "related": [
    "USN-8182-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-34785"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.