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

Exact source revision recorded 23 Oct 2026 15:48:27 UTC. It does not establish the source's current position. Latest evidence.

cve-program · CVE-2026-94439

Published

net/http

https://pkg.go.dev

Original vendor version evidence · not evaluated as a NuGet range
{
                    "vendor": "Go standard library",
                    "product": "net/http",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "net/http",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "1.26.9",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "1.27.0-0",
                            "lessThan": "1.27.2",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "chunkWriter.writeHeader"
                        },
                        {
                            "name": "CanonicalHeaderKey"
                        },
                        {
                            "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": "Cookie.String"
                        },
                        {
                            "name": "Cookie.Valid"
                        },
                        {
                            "name": "CrossOriginProtection.AddInsecureBypassPattern"
                        },
                        {
                            "name": "CrossOriginProtection.AddTrustedOrigin"
                        },
                        {
                            "name": "CrossOriginProtection.Check"
                        },
                        {
                            "name": "Dir.Open"
                        },
                        {
                            "name": "Error"
                        },
                        {
                            "name": "Get"
                        },
                        {
                            "name": "Handle"
                        },
                        {
                            "name": "HandleFunc"
                        },
                        {
                            "name": "HandlerFunc.ServeHTTP"
                        },
                        {
                            "name": "Head"
                        },
                        {
                            "name": "Header.Add"
                        },
                        {
                            "name": "Header.Del"
                        },
                        {
                            "name": "Header.Get"
                        },
                        {
                            "name": "Header.Set"
                        },
                        {
                            "name": "Header.Values"
                        },
                        {
                            "name": "Header.Write"
                        },
                        {
                            "name": "Header.WriteSubset"
                        },
                        {
                            "name": "ListenAndServe"
                        },
                        {
                            "name": "ListenAndServeTLS"
                        },
                        {
                            "name": "NewRequest"
                        },
                        {
                            "name": "NewRequestWithContext"
                        },
                        {
                            "name": "NotFound"
                        },
                        {
                            "name": "ParseCookie"
                        },
                        {
                            "name": "ParseSetCookie"
                        },
                        {
                            "name": "ParseTime"
                        },
                        {
                            "name": "Post"
                        },
                        {
                            "name": "PostForm"
                        },
                        {
                            "name": "ProxyFromEnvironment"
                        },
                        {
                            "name": "ReadRequest"
                        },
                        {
                            "name": "ReadResponse"
                        },
                        {
                            "name": "Redirect"
                        },
                        {
                            "name": "Request.AddCookie"
                        },
                        {
                            "name": "Request.BasicAuth"
                        },
                        {
                            "name": "Request.Cookie"
                        },
                        {
                            "name": "Request.Cookies"
                        },
                        {
                            "name": "Request.CookiesNamed"
                        },
                        {
                            "name": "Request.FormFile"
                        },
                        {
                            "name": "Request.FormValue"
                        },
                        {
                            "name": "Request.MultipartReader"
                        },
                        {
                            "name": "Request.ParseForm"
                        },
                        {
                            "name": "Request.ParseMultipartForm"
                        },
                        {
                            "name": "Request.PostFormValue"
                        },
                        {
                            "name": "Request.Referer"
                        },
                        {
                            "name": "Request.SetBasicAuth"
                        },
                        {
                            "name": "Request.UserAgent"
                        },
                        {
                            "name": "Request.Write"
                        },
                        {
                            "name": "Request.WriteProxy"
                        },
                        {
                            "name": "Response.Cookies"
                        },
                        {
                            "name": "Response.Location"
                        },
                        {
                            "name": "Response.Write"
                        },
                        {
                            "name": "ResponseController.EnableFullDuplex"
                        },
                        {
                            "name": "ResponseController.Flush"
                        },
                        {
                            "name": "ResponseController.Hijack"
                        },
                        {
                            "name": "ResponseController.SetReadDeadline"
                        },
                        {
                            "name": "ResponseController.SetWriteDeadline"
                        },
                        {
                            "name": "Serve"
                        },
                        {
                            "name": "ServeContent"
                        },
                        {
                            "name": "ServeFile"
                        },
                        {
                            "name": "ServeFileFS"
                        },
                        {
                            "name": "ServeMux.Handle"
                        },
                        {
                            "name": "ServeMux.HandleFunc"
                        },
                        {
                            "name": "ServeMux.ServeHTTP"
                        },
                        {
                            "name": "ServeTLS"
                        },
                        {
                            "name": "Server.Close"
                        },
                        {
                            "name": "Server.ListenAndServe"
                        },
                        {
                            "name": "Server.ListenAndServeTLS"
                        },
                        {
                            "name": "Server.Serve"
                        },
                        {
                            "name": "Server.ServeTLS"
                        },
                        {
                            "name": "Server.SetKeepAlivesEnabled"
                        },
                        {
                            "name": "Server.Shutdown"
                        },
                        {
                            "name": "SetCookie"
                        },
                        {
                            "name": "Transport.CancelRequest"
                        },
                        {
                            "name": "Transport.Clone"
                        },
                        {
                            "name": "Transport.CloseIdleConnections"
                        },
                        {
                            "name": "Transport.NewClientConn"
                        },
                        {
                            "name": "Transport.RoundTrip"
                        },
                        {
                            "name": "body.Close"
                        },
                        {
                            "name": "body.Read"
                        },
                        {
                            "name": "bodyEOFSignal.Close"
                        },
                        {
                            "name": "bodyEOFSignal.Read"
                        },
                        {
                            "name": "bodyLocked.Read"
                        },
                        {
                            "name": "bufioFlushWriter.Write"
                        },
                        {
                            "name": "cancelTimerBody.Close"
                        },
                        {
                            "name": "cancelTimerBody.Read"
                        },
                        {
                            "name": "checkConnErrorWriter.Write"
                        },
                        {
                            "name": "chunkWriter.Write"
                        },
                        {
                            "name": "connReader.Read"
                        },
                        {
                            "name": "connectMethodKey.String"
                        },
                        {
                            "name": "expectContinueReader.Close"
                        },
                        {
                            "name": "expectContinueReader.Read"
                        },
                        {
                            "name": "extraHeader.Write"
                        },
                        {
                            "name": "fileHandler.ServeHTTP"
                        },
                        {
                            "name": "fileTransport.RoundTrip"
                        },
                        {
                            "name": "globalOptionsHandler.ServeHTTP"
                        },
                        {
                            "name": "gzipReader.Close"
                        },
                        {
                            "name": "gzipReader.Read"
                        },
                        {
                            "name": "http1ClientConn.Close"
                        },
                        {
                            "name": "http1ClientConn.RoundTrip"
                        },
                        {
                            "name": "http2ClientConn.RoundTrip"
                        },
                        {
                            "name": "http2Handler.ServeHTTP"
                        },
                        {
                            "name": "http2ResponseWriter.Flush"
                        },
                        {
                            "name": "http2ResponseWriter.FlushError"
                        },
                        {
                            "name": "http2ResponseWriter.Push"
                        },
                        {
                            "name": "http2RoundTripper.RoundTrip"
                        },
                        {
                            "name": "http3ServerHandler.ServeHTTP"
                        },
                        {
                            "name": "initALPNRequest.ServeHTTP"
                        },
                        {
                            "name": "loggingConn.Close"
                        },
                        {
                            "name": "loggingConn.Read"
                        },
                        {
                            "name": "loggingConn.Write"
                        },
                        {
                            "name": "maxBytesReader.Close"
                        },
                        {
                            "name": "maxBytesReader.Read"
                        },
                        {
                            "name": "onceCloseListener.Close"
                        },
                        {
                            "name": "persistConn.Read"
                        },
                        {
                            "name": "persistConnWriter.ReadFrom"
                        },
                        {
                            "name": "persistConnWriter.Write"
                        },
                        {
                            "name": "populateResponse.Write"
                        },
                        {
                            "name": "populateResponse.WriteHeader"
                        },
                        {
                            "name": "readTrackingBody.Close"
                        },
                        {
                            "name": "readTrackingBody.Read"
                        },
                        {
                            "name": "readWriteCloserBody.CloseWrite"
                        },
                        {
                            "name": "readWriteCloserBody.Read"
                        },
                        {
                            "name": "redirectHandler.ServeHTTP"
                        },
                        {
                            "name": "response.Flush"
                        },
                        {
                            "name": "response.FlushError"
                        },
                        {
                            "name": "response.Hijack"
                        },
                        {
                            "name": "response.ReadFrom"
                        },
                        {
                            "name": "response.Write"
                        },
                        {
                            "name": "response.WriteHeader"
                        },
                        {
                            "name": "response.WriteString"
                        },
                        {
                            "name": "serverHandler.ServeHTTP"
                        },
                        {
                            "name": "socksDialer.DialWithConn"
                        },
                        {
                            "name": "socksUsernamePassword.Authenticate"
                        },
                        {
                            "name": "stringWriter.WriteString"
                        },
                        {
                            "name": "timeoutHandler.ServeHTTP"
                        },
                        {
                            "name": "timeoutWriter.Write"
                        },
                        {
                            "name": "timeoutWriter.WriteHeader"
                        },
                        {
                            "name": "transportReadFromServerError.Error"
                        },
                        {
                            "name": "unencryptedHTTP2Request.ServeHTTP"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 9 Nov 11:51 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current