{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-94439", "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "state": "PUBLISHED", "assignerShortName": "Go", "dateReserved": "2026-09-21T16:43:04.757Z", "datePublished": "2026-10-08T22:53:59.976Z", "dateUpdated": "2026-10-08T22:53:59.976Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc", "shortName": "Go", "dateUpdated": "2026-10-08T22:53:59.976Z"}, "title": "HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http", "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"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"}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"}]}], "references": [{"url": "https://go.dev/cl/847311"}, {"url": "https://go.dev/issue/81744"}, {"url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}, {"url": "https://pkg.go.dev/vuln/GO-2026-6613"}], "credits": [{"lang": "en", "value": "Jakub Ciolek (https://ciolek.dev)"}]}}}

{}

{"affected": [{"affectedData": [{"collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "packageName": "net/http", "product": "net/http", "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"}], "vendor": "Go standard library", "versions": [{"lessThan": "1.26.9", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "1.27.2", "status": "affected", "version": "1.27.0-0", "versionType": "semver"}]}], "source": "security@golang.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-94439", "lastModified": "2026-10-08T23:17:04.760", "metrics": {}, "published": "2026-10-08T23:17:04.760", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/847311"}, {"source": "security@golang.org", "url": "https://go.dev/issue/81744"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-6613"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Received"}

{"bugzilla": {"description": "net/http: golang: net/http: HTTP request smuggling via improper handling of HTTP/1 CONNECT responses", "id": "2548335", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2548335"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["A flaw was found in Go's net/http package. When an HTTP server sends a successful response to an HTTP/1 CONNECT request without taking raw control of the connection, it improperly continues to process incoming data as standard HTTP requests instead of establishing a tunnel. A remote attacker can exploit this behavior to conduct HTTP request smuggling through intermediate proxy servers, potentially bypassing security controls."], "name": "CVE-2026-94439", "package_state": [{"cpe": "cpe:/a:redhat:ocp_tools", "fix_state": "Out of support scope", "package_name": "helm", "product_name": "OpenShift Developer Tools and Services"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines-client", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "kn-workflow-plugin", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-clients", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Fix deferred", "package_name": "istio-proxy", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:service_mesh:3", "fix_state": "Affected", "impact": "moderate", "package_name": "openshift-golang-builder-container", "product_name": "OpenShift Service Mesh 3"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "automation-gateway-proxy", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Out of support scope", "package_name": "automation-gateway-proxy-openssl30", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Out of support scope", "package_name": "automation-gateway-proxy-openssl32", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Fix deferred", "package_name": "receptor", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:ceph_storage:7", "fix_state": "Fix 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Satellite 6"}, {"cpe": "cpe:/a:redhat:service_interconnect:1", "fix_state": "Out of support scope", "package_name": "skupper-cli", "product_name": "Red Hat Service Interconnect 1"}, {"cpe": "cpe:/a:redhat:service_interconnect:2", "fix_state": "Fix deferred", "package_name": "skupper-cli", "product_name": "Red Hat Service Interconnect 2"}, {"cpe": "cpe:/a:redhat:amq_streams:2", "fix_state": "Out of support scope", "package_name": "golang-github-danielqsj-kafka_exporter", "product_name": "streams for Apache Kafka 2"}, {"cpe": "cpe:/a:redhat:amq_streams:3", "fix_state": "Fix deferred", "package_name": "golang-github-danielqsj-kafka_exporter", "product_name": "streams for Apache Kafka 3"}], "public_date": "2026-10-08T22:53:59Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-94439\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-94439\nhttps://go.dev/cl/847311\nhttps://go.dev/issue/81744\nhttps://groups.google.com/g/golang-announce/c/U2fTuyDJznI\nhttps://pkg.go.dev/vuln/GO-2026-6613"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.26.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.27.0-0,1.27.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "net/http", "source": "cna", "vendor": "Go standard library"}, "product": "net/http", "vendor": "go_standard_library"}], "created": "2026-10-09T00:30:17.492591+00:00", "updated": "2026-10-09T05:00:14.029544+00:00", "vendors": ["go_standard_library", "go_standard_library$PRODUCT$net/http"]}