GHSA-JXHC-Q857-3J6G

Vulnerability from github – Published: 2021-07-12 16:58 – Updated: 2026-04-06 23:12
VLAI
Summary
Regular Expression Denial of Service in Addressable templates
Details

Impact

Within 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.

Patches

The 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.

Workarounds

The vulnerability can be avoided by only creating Template objects from trusted sources that have been validated not to produce catastrophic backtracking.

References

  • https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS
  • https://cwe.mitre.org/data/definitions/1333.html
  • https://www.regular-expressions.info/catastrophic.html

For more information

If you have any questions or comments about this advisory: * Open an issue

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.7.0"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "addressable"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.3.0"
            },
            {
              "fixed": "2.8.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-32740"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333",
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-07-06T15:25:32Z",
    "nvd_published_at": "2021-07-06T15:15:00Z",
    "severity": "HIGH"
  },
  "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)",
  "id": "GHSA-jxhc-q857-3j6g",
  "modified": "2026-04-06T23:12:46Z",
  "published": "2021-07-12T16:58:33Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Regular Expression Denial of Service in Addressable templates"
}



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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

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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.



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