Inefficient Regular Expression Complexity in v8n

{
  "id": "154fcafa299bcb4f8ea4346b0fb6efb25d89030a3cfbeedda72a8af6c9c2157a",
  "url": "https://osv.dev/vulnerability/CVE-2022-35923",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Inefficient Regular Expression Complexity in v8n",
    "summary": "v8n is a javascript validation library. Versions of v8n prior to 1.5.1 were found to have an inefficient regular expression complexity in the `lowercase()` and `uppercase()` regex which could lead to a denial of service attack. In testing of the `lowercase()` function a payload of 'a' + 'a'.repeat(i) + 'A' with 32 leading characters took 29443 ms to execute. The same issue happens with uppercase(). Users are advised to upgrade. There are no known workarounds for this issue.",
    "evidence": "osv:CVE-2022-35923",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2022-35923",
      "aliases": [
        "CVE-2022-35923",
        "GHSA-xrx9-gj26-5wx9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/imbrn/v8n",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "60afb53baab7c2e8de4dd9141633753a3a018a39"
                },
                {
                  "fixed": "92393862156fad190c05ec3f6e2bc73308dcd2f9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:v8n_project:v8n:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.5.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "92393862156fad190c05ec3f6e2bc73308dcd2f9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.5.0",
            "v1.4.0",
            "v1.3.3",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-35923.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.591813410Z",
      "provider": "osv",
      "references": [
        "https://huntr.dev/bounties/2d92f644-593b-43b4-bfd1-c8042ac60609/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/35xxx/CVE-2022-35923.json",
        "https://github.com/imbrn/v8n/security/advisories/GHSA-xrx9-gj26-5wx9",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-35923",
        "https://github.com/imbrn/v8n/commit/92393862156fad190c05ec3f6e2bc73308dcd2f9"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-400"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/35xxx/CVE-2022-35923.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-35923",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506018,
  "published_at": "2022-08-02T20:10:11+00:00"
}