{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "3.0"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "dbfa2854ff31a863326bd6660d4e55c6f068db9e"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "3.0",
                "range": [
                  {
                    "fixed": "e39e4e7fa57d693da8d1f2422a7c9a9c7a6d5cc7"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e39e4e7fa57d693da8d1f2422a7c9a9c7a6d5cc7"
            },
            {
              "fixed": "dbfa2854ff31a863326bd6660d4e55c6f068db9e"
            }
          ],
          "repo": "https://github.com/facelessuser/soupsieve",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6655-6qjp-jx7x"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126191.json"
  },
  "details": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 3.0, the CSS_ESCAPES and IDENTIFIER regular-expression subpatterns can backtrack exponentially on runs of ambiguous digit escapes in an attribute-name or tag position of an otherwise valid selector. The failure occurs during selector compilation through soupsieve.compile() or Beautiful Soup select() before SELECTOR_LIMIT is applied, so an application that accepts untrusted selector strings can have a worker stalled by a short input. This issue is fixed in version 3.0.",
  "id": "CVE-2026-126191",
  "modified": "2026-11-14T02:31:09.554000381Z",
  "published": "2026-11-12T16:57:01.566Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/facelessuser/soupsieve/releases/tag/3.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126191.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-6655-6qjp-jx7x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126191"
    },
    {
      "type": "FIX",
      "url": "https://github.com/facelessuser/soupsieve/commit/dbfa2854ff31a863326bd6660d4e55c6f068db9e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/facelessuser/soupsieve/pull/300"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Soup Sieve: Exponential ReDoS in selector compilation via \\9-run in CSS_ESCAPES/IDENTIFIER"
}