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CVE-2025-57804 h2 allows HTTP Request Smuggling due to illegal characters in headers

🗓️ 25 Aug 2025 21:04:52Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 5 Views

CVE-2025-57804: h2 downgrade enables header CRLF-based request smuggling to HTTP/1.1; fixed in 4.3.0

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Affected
Refs
[
  {
    "vendor": "python-hyper",
    "product": "h2",
    "versions": [
      {
        "version": "< 4.3.0",
        "status": "affected"
      }
    ]
  }
]

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