GHSA-X4HG-HFWF-P9MW

Vulnerability from github – Published: 2026-07-02 20:20 – Updated: 2026-07-02 20:20
VLAI
Summary
@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation
Details

Summary

The HTMLInputElement.checkValidity() method constructed a RegExp directly from the user-controlled pattern property without any sanitization or timeout protection. This allowed an attacker to inject a regex with catastrophic backtracking, freezing the event loop.

Fix

Fixed in commit https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b on main. Added: - Pattern length limit (1024 characters) - Nested quantifier detection (hasNestedQuantifiers) that rejects patterns like (a+)+ before constructing the regex - Patterns exceeding limits are treated as non-matching (safe default)

Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.0.21"
      },
      "package": {
        "ecosystem": "npm",
        "name": "@asymmetric-effort/nogginlessdom"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.22"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T20:20:04Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe `HTMLInputElement.checkValidity()` method constructed a `RegExp` directly from the user-controlled `pattern` property without any sanitization or timeout protection. This allowed an attacker to inject a regex with catastrophic backtracking, freezing the event loop.\n\n## Fix\n\nFixed in commit https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b on `main`. Added:\n- Pattern length limit (1024 characters)\n- Nested quantifier detection (`hasNestedQuantifiers`) that rejects patterns like `(a+)+` before constructing the regex\n- Patterns exceeding limits are treated as non-matching (safe default)",
  "id": "GHSA-x4hg-hfwf-p9mw",
  "modified": "2026-07-02T20:20:04Z",
  "published": "2026-07-02T20:20:04Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/asymmetric-effort/NogginLessDom/security/advisories/GHSA-x4hg-hfwf-p9mw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/asymmetric-effort/NogginLessDom/commit/25a3cbac665fae5663f8b71c073b80c3152dbe7b"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/asymmetric-effort/NogginLessDom"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "@asymmetric-effort/nogginlessdom vulnerable to ReDoS via user-controlled regex in HTMLInputElement pattern validation"
}



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