GHSA-94JW-HQVJ-VW74

Vulnerability from github – Published: 2026-06-05 15:32 – Updated: 2026-07-17 17:05
VLAI
Summary
sanic-cors contains an improper regular expression in the try_match() function
Details

sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.

Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sanic-cors"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-37737"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-346"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-17T17:05:30Z",
    "nvd_published_at": "2026-06-05T15:16:51Z",
    "severity": "MODERATE"
  },
  "details": "sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.",
  "id": "GHSA-94jw-hqvj-vw74",
  "modified": "2026-07-17T17:05:30Z",
  "published": "2026-06-05T15:32:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-37737"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/ashleysommer/sanic-cors"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py"
    },
    {
      "type": "WEB",
      "url": "https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md"
    },
    {
      "type": "WEB",
      "url": "https://pypi.org/project/Sanic-Cors"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sanic-cors contains an improper regular expression in the try_match() function"
}



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