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CVE-2026-85999 Soup Sieve: Polynomial-time ReDoS (O(n²)) in the whitespace/comment trimming regex `RE_WS_END` (triggers on VALID selectors)

🗓️ 17 Sep 2026 15:23:37Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 3 Views

Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.9, selector_iter in src/soupsieve/css_parser.py trims the raw selector with RE_WS_END, an end-anchored WSC whitespace-and-comment expression used with searc...

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Affected
Refs
[
  {
    "vendor": "facelessuser",
    "product": "soupsieve",
    "versions": [
      {
        "version": "< 2.9",
        "status": "affected"
      }
    ]
  }
]

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17 Sep 2026 15:23Current
CVSS 3.15.3
3