{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.17.1"
              },
              {
                "fixed": "1.38.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "c36c1b42c49a5519b5424733de58412d6f387209"
            },
            {
              "fixed": "1be936e2491ccebe152bd736dfc91eb1422c8bec"
            },
            {
              "fixed": "09e53d15109121636a416310ea0d510bd292c463"
            }
          ],
          "repo": "https://github.com/symfony/polyfill",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-2xf4-cg6j-vhgq"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1289"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46644.json"
  },
  "details": "Symfony Polyfill backports PHP features and provides compatibility layers for extensions and functions. From 1.17.1 until 1.38.1, symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload is empty or decodes to ASCII-only code points because Idn::process() does not enforce the UTS #46 revision 33 requirement that decoded ACE labels contain at least one non-ASCII code point. Originally unequal domain names can be regarded as equal, which can lead to blacklist bypassing, inconsistent URL parsing, and server-side request forgery in applications using the polyfill to canonicalise or compare hostnames. This issue is fixed in version 1.38.1.",
  "id": "CVE-2026-46644",
  "modified": "2026-07-17T03:41:48.024000427Z",
  "published": "2026-07-14T20:48:31.771Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/symfony/polyfill/releases/tag/v1.38.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46644.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/symfony/polyfill/security/advisories/GHSA-2xf4-cg6j-vhgq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46644"
    },
    {
      "type": "FIX",
      "url": "https://github.com/symfony/polyfill/commit/1be936e2491ccebe152bd736dfc91eb1422c8bec"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "symfony/polyfill-intl-idn accepts xn-- labels whose Punycode payload decodes to ASCII-only: insecure equivalence"
}