Action Mailer has possible ReDoS vulnerability in block_format

{
  "id": "9baba157ab17cccaa71dbae14f8c7d24689f2b1a168ab2414d2d1353d29d957c",
  "url": "https://osv.dev/vulnerability/CVE-2024-47889",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Action Mailer has possible ReDoS vulnerability in block_format",
    "summary": "Action Mailer is a framework for designing email service layers. Starting in version 3.0.0 and prior to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, and 7.2.1.1, there is a possible ReDoS vulnerability in the block_format helper in Action Mailer. Carefully crafted text can cause the block_format helper to take an unexpected amount of time, possibly resulting in a DoS vulnerability. All users running an affected release should either upgrade to versions 6.1.7.9, 7.0.8.5, 7.1.4.1, or 7.2.1.1 or apply the relevant patch immediately. As a workaround, users can avoid calling the `block_format` helper or upgrade to Ruby 3.2. Ruby 3.2 has mitigations for this problem, so Rails applications using Ruby 3.2 or newer are unaffected. Rails 8.0.0.beta1 requires Ruby 3.2 or greater so is unaffected.",
    "evidence": "osv:CVE-2024-47889",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-47889",
      "aliases": [
        "BIT-rails-2024-47889",
        "CVE-2024-47889",
        "GHSA-h47h-mwp9-c6q6"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rails/rails",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9891ca89c69732a21743f0349f2995956a7802e7"
                },
                {
                  "fixed": "b2fbbfbcaa3d662c68a9ee21ab6cf95eccc2b4ec"
                },
                {
                  "introduced": "984c3ef2775781d47efa9f541ce570daa2434a80"
                },
                {
                  "fixed": "f61f4ef957f80e1668797fce8a2393f3edb7ed76"
                },
                {
                  "introduced": "d39db5d1891f7509cde2efc425c9d69bbb77e670"
                },
                {
                  "fixed": "5b5f0da552f62e85e31e2d747d52aed2a3133f48"
                },
                {
                  "introduced": "fb6c4305939da06efdf2893d99130e7829c53e8b"
                },
                {
                  "fixed": "a1f6a13f691e0929d40b7e1b1e0d31aa69778128"
                },
                {
                  "fixed": "0e5694f4d32544532d2301a9b4084eacb6986e94"
                },
                {
                  "fixed": "3612e3eb3fbafed4f85e1c6ea4c7b6addbb0fdd3"
                },
                {
                  "fixed": "985f1923fa62806ff676e41de67c3b4552131ab9"
                },
                {
                  "fixed": "be898cc996986decfe238341d96b2a6573b8fd2e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.0.0"
                      },
                      {
                        "fixed": "6.1.7.9"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "7.0.0"
                      },
                      {
                        "fixed": "7.0.8.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "7.1.0"
                      },
                      {
                        "fixed": "7.1.4.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "7.2.0"
                      },
                      {
                        "fixed": "7.2.1.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0e5694f4d32544532d2301a9b4084eacb6986e94"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3612e3eb3fbafed4f85e1c6ea4c7b6addbb0fdd3"
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                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
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                        "fixed": "985f1923fa62806ff676e41de67c3b4552131ab9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "be898cc996986decfe238341d96b2a6573b8fd2e"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v7.0.8.4",
            "v7.1.4",
            "v7.0.8.3",
            "v7.0.8.2",
            "v7.0.8.1",
            "v7.0.8",
            "v7.1.3",
            "v7.1.2",
            "v7.1.1",
            "v7.1.0",
            "v7.0.7",
            "v7.0.6",
            "v7.0.5",
            "v7.0.4",
            "v7.0.3",
            "v7.0.2",
            "v7.0.1",
            "v7.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-47889.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.354437915Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47889.json",
        "https://github.com/rails/rails/security/advisories/GHSA-h47h-mwp9-c6q6",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47889",
        "https://github.com/rails/rails/commit/0e5694f4d32544532d2301a9b4084eacb6986e94",
        "https://github.com/rails/rails/commit/3612e3eb3fbafed4f85e1c6ea4c7b6addbb0fdd3",
        "https://github.com/rails/rails/commit/985f1923fa62806ff676e41de67c3b4552131ab9",
        "https://github.com/rails/rails/commit/be898cc996986decfe238341d96b2a6573b8fd2e"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1333"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47889.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-47889",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518807,
  "published_at": "2024-10-16T20:55:33.958+00:00"
}