GO-2026-6613

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Source

https://pkg.go.dev/vuln/GO-2026-6613

Import Source

https://vuln.go.dev/ID/GO-2026-6613.json

JSON Data

https://api.osv.dev/v1/vulns/GO-2026-6613

Aliases

CVE-2026-94439

Published

2026-10-08T22:31:09Z

Modified

2026-10-08T22:45:07Z

Summary

HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http

Details

When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1 CONNECT converts the connection into a tunnel, the server should not treat the connection as continuing to contain HTTP.

The impact of this misbehavior is mostly limited to potential request smuggling, where an intermediate proxy considers the data on the connection to be tunneled and the server considers it to be HTTP.

Database specific

{
    "review_status": "REVIEWED",
    "url": "https://pkg.go.dev/vuln/GO-2026-6613"
}

References

Credits

- Jakub Ciolek (https://ciolek.dev)

Affected packages

Go / stdlib

Package

Name: stdlib; View open source insights on deps.dev
Purl: pkg:golang/stdlib

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.26.9

Introduced

1.27.0-0

Fixed

1.27.2

Ecosystem specific

{
    "imports": [
        {
            "path": "net/http",
            "symbols": [
                "CanonicalHeaderKey",
                "Client.CloseIdleConnections",
                "Client.Do",
                "Client.Get",
                "Client.Head",
                "Client.Post",
                "Client.PostForm",
                "ClientConn.Close",
                "ClientConn.RoundTrip",
                "Cookie.String",
                "Cookie.Valid",
                "CrossOriginProtection.AddInsecureBypassPattern",
                "CrossOriginProtection.AddTrustedOrigin",
                "CrossOriginProtection.Check",
                "Dir.Open",
                "Error",
                "Get",
                "Handle",
                "HandleFunc",
                "HandlerFunc.ServeHTTP",
                "Head",
                "Header.Add",
                "Header.Del",
                "Header.Get",
                "Header.Set",
                "Header.Values",
                "Header.Write",
                "Header.WriteSubset",
                "ListenAndServe",
                "ListenAndServeTLS",
                "NewRequest",
                "NewRequestWithContext",
                "NotFound",
                "ParseCookie",
                "ParseSetCookie",
                "ParseTime",
                "Post",
                "PostForm",
                "ProxyFromEnvironment",
                "ReadRequest",
                "ReadResponse",
                "Redirect",
                "Request.AddCookie",
                "Request.BasicAuth",
                "Request.Cookie",
                "Request.Cookies",
                "Request.CookiesNamed",
                "Request.FormFile",
                "Request.FormValue",
                "Request.MultipartReader",
                "Request.ParseForm",
                "Request.ParseMultipartForm",
                "Request.PostFormValue",
                "Request.Referer",
                "Request.SetBasicAuth",
                "Request.UserAgent",
                "Request.Write",
                "Request.WriteProxy",
                "Response.Cookies",
                "Response.Location",
                "Response.Write",
                "ResponseController.EnableFullDuplex",
                "ResponseController.Flush",
                "ResponseController.Hijack",
                "ResponseController.SetReadDeadline",
                "ResponseController.SetWriteDeadline",
                "Serve",
                "ServeContent",
                "ServeFile",
                "ServeFileFS",
                "ServeMux.Handle",
                "ServeMux.HandleFunc",
                "ServeMux.ServeHTTP",
                "ServeTLS",
                "Server.Close",
                "Server.ListenAndServe",
                "Server.ListenAndServeTLS",
                "Server.Serve",
                "Server.ServeTLS",
                "Server.SetKeepAlivesEnabled",
                "Server.Shutdown",
                "SetCookie",
                "Transport.CancelRequest",
                "Transport.Clone",
                "Transport.CloseIdleConnections",
                "Transport.NewClientConn",
                "Transport.RoundTrip",
                "body.Close",
                "body.Read",
                "bodyEOFSignal.Close",
                "bodyEOFSignal.Read",
                "bodyLocked.Read",
                "bufioFlushWriter.Write",
                "cancelTimerBody.Close",
                "cancelTimerBody.Read",
                "checkConnErrorWriter.Write",
                "chunkWriter.Write",
                "chunkWriter.writeHeader",
                "connReader.Read",
                "connectMethodKey.String",
                "expectContinueReader.Close",
                "expectContinueReader.Read",
                "extraHeader.Write",
                "fileHandler.ServeHTTP",
                "fileTransport.RoundTrip",
                "globalOptionsHandler.ServeHTTP",
                "gzipReader.Close",
                "gzipReader.Read",
                "http1ClientConn.Close",
                "http1ClientConn.RoundTrip",
                "http2ClientConn.RoundTrip",
                "http2Handler.ServeHTTP",
                "http2ResponseWriter.Flush",
                "http2ResponseWriter.FlushError",
                "http2ResponseWriter.Push",
                "http2RoundTripper.RoundTrip",
                "http3ServerHandler.ServeHTTP",
                "initALPNRequest.ServeHTTP",
                "loggingConn.Close",
                "loggingConn.Read",
                "loggingConn.Write",
                "maxBytesReader.Close",
                "maxBytesReader.Read",
                "onceCloseListener.Close",
                "persistConn.Read",
                "persistConnWriter.ReadFrom",
                "persistConnWriter.Write",
                "populateResponse.Write",
                "populateResponse.WriteHeader",
                "readTrackingBody.Close",
                "readTrackingBody.Read",
                "readWriteCloserBody.CloseWrite",
                "readWriteCloserBody.Read",
                "redirectHandler.ServeHTTP",
                "response.Flush",
                "response.FlushError",
                "response.Hijack",
                "response.ReadFrom",
                "response.Write",
                "response.WriteHeader",
                "response.WriteString",
                "serverHandler.ServeHTTP",
                "socksDialer.DialWithConn",
                "socksUsernamePassword.Authenticate",
                "stringWriter.WriteString",
                "timeoutHandler.ServeHTTP",
                "timeoutWriter.Write",
                "timeoutWriter.WriteHeader",
                "transportReadFromServerError.Error",
                "unencryptedHTTP2Request.ServeHTTP"
            ]
        }
    ]
}

Database specific

source

"https://vuln.go.dev/ID/GO-2026-6613.json"