{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.8.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "eb4397618709186c109400448c6043b728217dc3"
            },
            {
              "fixed": "28108ab805818c832d9568142a99844fd95a0d39"
            }
          ],
          "repo": "https://github.com/facelessuser/soupsieve",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-836r-79rf-4m37"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1333",
      "CWE-400"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49477.json"
  },
  "details": "Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.",
  "id": "CVE-2026-49477",
  "modified": "2026-07-17T03:41:42.609621085Z",
  "published": "2026-07-14T20:51:29.369Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/facelessuser/soupsieve/releases/tag/2.8.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49477.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/facelessuser/soupsieve/security/advisories/GHSA-836r-79rf-4m37"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49477"
    },
    {
      "type": "FIX",
      "url": "https://github.com/facelessuser/soupsieve/commit/eb4397618709186c109400448c6043b728217dc3"
    }
  ],
  "schema_version": "1.8.0",
  "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: Regular Expression Denial of Service (ReDoS) in soupsieve Selector Parser"
}