CVE-2021-32740: Addressable Denial of Service Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jxhc-q857-3j6g",
  "modified" : "2026-04-06T23:12:46Z",
  "published" : "2021-07-12T16:58:33Z",
  "aliases" : [ "CVE-2021-32740" ],
  "summary" : "Regular Expression Denial of Service in Addressable templates",
  "details" : "### Impact\n\nWithin the URI template implementation in Addressable, a maliciously crafted template may result in uncontrolled resource consumption, leading to denial of service when matched against a URI. In typical usage, templates would not normally be read from untrusted user input, but nonetheless, no previous security advisory for Addressable has cautioned against doing this. Users of the parsing capabilities in Addressable but not the URI template capabilities are unaffected.\n\n### Patches\n\nThe vulnerability was introduced in version 2.3.0 (previously yanked) and has been present in all subsequent versions up to, and including, 2.7.0. It is fixed in version 2.8.0.\n\n### Workarounds\n\nThe vulnerability can be avoided by only creating Template objects from trusted sources that have been validated not to produce catastrophic backtracking.\n\n### References\n\n- https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS\n- https://cwe.mitre.org/data/definitions/1333.html\n- https://www.regular-expressions.info/catastrophic.html\n\n### For more information\nIf you have any questions or comments about this advisory:\n* [Open an issue](https://github.com/sporkmonger/addressable/issues)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "addressable"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.3.0"
      }, {
        "fixed" : "2.8.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.7.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/sporkmonger/addressable/security/advisories/GHSA-jxhc-q857-3j6g"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32740"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sporkmonger/addressable/commit/0d8a3127e35886ce9284810a7f2438bff6b43cbc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sporkmonger/addressable/commit/89c76130ce255c601f642a018cb5fb5a80e679a7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/sporkmonger/addressable/commit/92685096b1f7235ed8986c03ce30a24972eed848#diff-fb36d3dc67e6565ffde17e666a98697f48e76dac38fabf1bb9e97cdf3b583d76"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-jxhc-q857-3j6g"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/addressable/CVE-2021-32740.yml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/sporkmonger/addressable"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SDFQM2NHNAZ3NNUQZEJTYECYZYXV4UDS"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYPVOOQU7UB277UUERJMCNQLRCXRCIQ5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-06T15:25:32Z",
    "nvd_published_at" : "2021-07-06T15:15:00Z"
  }
}