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CVE-2026-33814 Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net

🗓️ 07 May 2026 19:41:17Reported by GoType 
cvelist
 cvelist
🔗 www.cve.org👁 30 Views

Infinite loop in HTTP/2 transport when SETTINGS_MAX_FRAME_SIZE is 0 causes CONTINUATION frames loop.

Related
Affected
Refs
[
  {
    "vendor": "golang.org/x/net",
    "product": "golang.org/x/net/http2",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "golang.org/x/net/http2",
    "versions": [
      {
        "version": "0",
        "lessThan": "0.53.0",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "clientConnReadLoop.processSettingsNoWrite"
      },
      {
        "name": "Transport.NewClientConn"
      },
      {
        "name": "Transport.RoundTrip"
      },
      {
        "name": "Transport.RoundTripOpt"
      },
      {
        "name": "clientConnPool.GetClientConn"
      },
      {
        "name": "noDialClientConnPool.GetClientConn"
      },
      {
        "name": "noDialH2RoundTripper.NewClientConn"
      },
      {
        "name": "noDialH2RoundTripper.RoundTrip"
      },
      {
        "name": "unencryptedTransport.RoundTrip"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Go standard library",
    "product": "net/http",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "net/http",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.25.10",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.26.0-0",
        "lessThan": "1.26.3",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "http2clientConnReadLoop.processSettingsNoWrite"
      },
      {
        "name": "Client.CloseIdleConnections"
      },
      {
        "name": "Client.Do"
      },
      {
        "name": "Client.Get"
      },
      {
        "name": "Client.Head"
      },
      {
        "name": "Client.Post"
      },
      {
        "name": "Client.PostForm"
      },
      {
        "name": "ClientConn.Close"
      },
      {
        "name": "ClientConn.RoundTrip"
      },
      {
        "name": "Get"
      },
      {
        "name": "Head"
      },
      {
        "name": "Post"
      },
      {
        "name": "PostForm"
      },
      {
        "name": "Transport.CloseIdleConnections"
      },
      {
        "name": "Transport.NewClientConn"
      },
      {
        "name": "Transport.RoundTrip"
      },
      {
        "name": "http1ClientConn.Close"
      },
      {
        "name": "http1ClientConn.RoundTrip"
      },
      {
        "name": "http2Transport.NewClientConn"
      },
      {
        "name": "http2Transport.RoundTrip"
      },
      {
        "name": "http2Transport.RoundTripOpt"
      },
      {
        "name": "http2clientConnPool.GetClientConn"
      },
      {
        "name": "http2noDialClientConnPool.GetClientConn"
      },
      {
        "name": "http2noDialH2RoundTripper.NewClientConn"
      },
      {
        "name": "http2noDialH2RoundTripper.RoundTrip"
      },
      {
        "name": "http2unencryptedTransport.RoundTrip"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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