{
  "schema_version": "1.4.0",
  "id": "GHSA-c6qg-cjj8-47qp",
  "modified": "2025-01-09T15:36:58Z",
  "published": "2023-03-15T21:36:02Z",
  "aliases": [
    "CVE-2023-27539"
  ],
  "summary": "Possible Denial of Service Vulnerability in Rack's header parsing",
  "details": "There is a denial of service vulnerability in the header parsing component of Rack. This vulnerability has been assigned the CVE identifier CVE-2023-27539.\n\nVersions Affected: >= 2.0.0 Not affected: None. Fixed Versions: 2.2.6.4, 3.0.6.1\n\n# Impact\nCarefully crafted input can cause header parsing in Rack to take an unexpected amount of time, possibly resulting in a denial of service attack vector. Any applications that parse headers using Rack (virtually all Rails applications) are impacted.\n\n# Workarounds\nSetting Regexp.timeout in Ruby 3.2 is a possible workaround.\n",
  "severity": [],
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rack"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.2.6.4"
            }
          ]
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rack"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.6.1"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27539"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rack/rack/commit/231ef369ad0b542575fb36c74fcfcfabcf6c530c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rack/rack/commit/ee7919ea04303717858be1c3f16b406adc6d8cff"
    },
    {
      "type": "WEB",
      "url": "https://discuss.rubyonrails.org/t/cve-2023-27539-possible-denial-of-service-vulnerability-in-racks-header-parsing/82466"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rack/rack"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2023-27539.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/04/msg00017.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20231208-0016"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2023/dsa-5530"
    }
  ],
  "database_specific": {
    "cwe_ids": [],
    "severity": "LOW",
    "github_reviewed": true,
    "github_reviewed_at": "2023-03-15T21:36:02Z",
    "nvd_published_at": "2025-01-09T01:15:07Z"
  }
}