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CVE-2026-48743

🗓️ 26 Jun 2026 17:34:22Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov👁 57 Views🌐 WEB

Envoy before 1.38.1 can smuggle HTTP/3 to HTTP/1 requests via nonzero Content-Length headers-only.

Related
Detection
Affected
Refs
Paths
NVD
Vulners
Node
OR
envoyproxyenvoyRange1.35.01.35.13
envoyproxyenvoyRange1.36.01.36.9
envoyproxyenvoyRange1.37.01.37.5
envoyproxyenvoyRange1.38.01.38.3
[
  {
    "vendor": "envoyproxy",
    "product": "envoy",
    "versions": [
      {
        "version": ">= 1.38.0, < 1.38.1",
        "status": "affected"
      },
      {
        "version": ">= 1.37.0, < 1.37.3",
        "status": "affected"
      },
      {
        "version": ">= 1.36.0, < 1.36.7",
        "status": "affected"
      },
      {
        "version": ">= 1.35.0, < 1.35.11",
        "status": "affected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
Content-Lengthpath/pwnHTTP/3 request with nonzero Content-Length can deserialize as a second upstream HTTP/1.1 request due to upstream backend timing, enabling route bypass/desync.CWE-444

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29 Jun 2026 18:27Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.17.5
EPSS0.00298
SSVC
57