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CVE-2026-73550 Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM in Envoy

🗓️ 21 Sep 2026 19:49:28Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 21 Views

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy copies every decoded HTTP/2 Host header value before discarding it when :authority is already present. The d...

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Rows per page
[
  {
    "vendor": "envoyproxy",
    "product": "envoy",
    "versions": [
      {
        "version": "< 1.36.10",
        "status": "affected"
      },
      {
        "version": ">= 1.37.0, < 1.37.6",
        "status": "affected"
      },
      {
        "version": ">= 1.38.0, < 1.38.4",
        "status": "affected"
      },
      {
        "version": ">= 1.39.0, < 1.39.1",
        "status": "affected"
      }
    ]
  }
]

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21 Sep 2026 19:49Current
CVSS 3.17.5
21