CVE-2026-78669 - Vulnerability Details - OpenCVE

A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Go standard library

net/http

unaffected

Version	Status	Constraints
`0`	affected	< 1.26.9

Go standard library

net/http/internal/http2

unaffected

Version	Status	Constraints
`1.27.0-0`	affected	< 1.27.2

golang.org/x/net

golang.org/x/net/http2

unaffected

Version	Status	Constraints
`0`	affected	< 0.60.0

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://go.dev/cl/847186
https://go.dev/cl/847308
https://go.dev/issue/81742
https://groups.google.com/g/golang-announce/c/U2fTuyDJznI
https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs
https://pkg.go.dev/vuln/GO-2026-6611

History

Thu, 08 Oct 2026 23:00:00 +0000

Type	Values Removed	Values Added
Description		A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values.
Title		Excessive CPU consumption from repeated initial window changes in net/http
References		https://go.dev/cl/847186 https://go.dev/cl/847308 https://go.dev/issue/81742 https://groups.google.com/g/golang-announce/c/U2fTuyDJznI https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs https://pkg.go.dev/vuln/GO-2026-6611

Projects

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MITRE

Status: PUBLISHED

Assigner: Go

Published: 2026-10-08T22:53:59.530Z

Updated: 2026-10-08T22:53:59.530Z

Reserved: 2026-08-24T23:36:15.739Z

Link: CVE-2026-78669

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-10-08T23:17:04.010

Modified: 2026-10-08T23:17:04.010

Link: CVE-2026-78669

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

No weakness.

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Asymmetric Resource Consumption (Amplification)"}]}], "references": [{"url": "https://go.dev/cl/847186"}, {"url": "https://go.dev/cl/847308"}, {"url": "https://go.dev/issue/81742"}, {"url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}, {"url": "https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs"}, {"url": "https://pkg.go.dev/vuln/GO-2026-6611"}], "credits": [{"lang": "en", "value": "Jakub Ciolek (https://ciolek.dev)"}]}}}

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{"name": "http2Framer.WritePing"}, {"name": "http2Framer.WritePriority"}, {"name": "http2Framer.WritePushPromise"}, {"name": "http2Framer.WriteRSTStream"}, {"name": "http2Framer.WriteRawFrame"}, {"name": "http2Framer.WriteSettings"}, {"name": "http2Framer.WriteSettingsAck"}, {"name": "http2Framer.WriteWindowUpdate"}, {"name": "http2GoAwayError.Error"}, {"name": "http2Server.ServeConn"}, {"name": "http2Setting.String"}, {"name": "http2SettingID.String"}, {"name": "http2SettingsFrame.ForeachSetting"}, {"name": "http2StreamError.Error"}, {"name": "http2Transport.CloseIdleConnections"}, {"name": "http2Transport.NewClientConn"}, {"name": "http2Transport.RoundTrip"}, {"name": "http2Transport.RoundTripOpt"}, {"name": "http2bufferedWriter.Flush"}, {"name": "http2bufferedWriter.Write"}, {"name": "http2bufferedWriterTimeoutWriter.Write"}, {"name": "http2chunkWriter.Write"}, {"name": "http2clientConnPool.GetClientConn"}, {"name": "http2connError.Error"}, {"name": "http2dataBuffer.Read"}, {"name": "http2duplicatePseudoHeaderError.Error"}, {"name": "http2gzipReader.Close"}, {"name": "http2gzipReader.Read"}, {"name": "http2headerFieldNameError.Error"}, {"name": "http2headerFieldValueError.Error"}, {"name": "http2netHTTPClientConn.Close"}, {"name": "http2netHTTPClientConn.RoundTrip"}, {"name": "http2noDialClientConnPool.GetClientConn"}, {"name": "http2noDialH2RoundTripper.NewClientConn"}, {"name": "http2noDialH2RoundTripper.RoundTrip"}, {"name": "http2pipe.Read"}, {"name": "http2priorityWriteSchedulerRFC7540.CloseStream"}, {"name": "http2priorityWriteSchedulerRFC7540.OpenStream"}, {"name": "http2priorityWriteSchedulerRFC7540.Pop"}, {"name": "http2priorityWriteSchedulerRFC9218.OpenStream"}, {"name": "http2priorityWriteSchedulerRFC9218.Pop"}, {"name": "http2pseudoHeaderError.Error"}, {"name": "http2randomWriteScheduler.Pop"}, {"name": "http2requestBody.Close"}, {"name": "http2requestBody.Read"}, {"name": "http2responseWriter.Flush"}, {"name": "http2responseWriter.FlushError"}, 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{"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"}]}, {"collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "packageName": "net/http/internal/http2", "product": "net/http/internal/http2", "programRoutines": [{"name": "outflow.add"}, {"name": "outflow.available"}, {"name": "outflow.setConnFlow"}, {"name": "outflow.take"}, {"name": "Server.serveConn"}, {"name": "serverConn.newStream"}, {"name": "serverConn.processSettingInitialWindowSize"}, {"name": "serverConn.processWindowUpdate"}, {"name": "serverConn.scheduleFrameWrite"}, {"name": "ClientConn.addStreamLocked"}, {"name": "Transport.newClientConn"}, {"name": "clientConnReadLoop.processSettingsNoWrite"}, {"name": "clientConnReadLoop.processWindowUpdate"}, {"name": "clientConnReadLoop.streamByID"}, {"name": "clientStream.awaitFlowControl"}, {"name": "clientStream.cleanupWriteRequest"}, {"name": "FrameWriteRequest.Consume"}, {"name": "ClientConn.Close"}, {"name": "ClientConn.Ping"}, {"name": "ClientConn.RoundTrip"}, {"name": "ClientConn.Shutdown"}, {"name": "Framer.ReadFrame"}, {"name": "Framer.ReadFrameForHeader"}, {"name": "Framer.ReadFrameHeader"}, {"name": "Framer.WriteContinuation"}, {"name": "Framer.WriteData"}, {"name": "Framer.WriteDataPadded"}, {"name": "Framer.WriteGoAway"}, {"name": "Framer.WriteHeaders"}, {"name": "Framer.WritePing"}, {"name": "Framer.WritePriority"}, {"name": "Framer.WritePriorityUpdate"}, {"name": "Framer.WritePushPromise"}, {"name": "Framer.WriteRSTStream"}, {"name": "Framer.WriteRawFrame"}, {"name": "Framer.WriteSettings"}, {"name": "Framer.WriteSettingsAck"}, {"name": "Framer.WriteWindowUpdate"}, {"name": "NetHTTPClientConn.Close"}, {"name": "NetHTTPClientConn.Ping"}, {"name": "NetHTTPClientConn.RoundTrip"}, {"name": "ReadFrameHeader"}, {"name": "Server.GracefulShutdown"}, {"name": "Server.ServeConn"}, {"name": "SettingsFrame.ForeachSetting"}, {"name": "Transport.AddConn"}, {"name": "Transport.CloseIdleConnections"}, {"name": "Transport.NewClientConn"}, {"name": "Transport.RoundTrip"}, {"name": "Transport.RoundTripOpt"}, {"name": "bufferedWriter.Flush"}, {"name": "bufferedWriter.Write"}, {"name": "bufferedWriterTimeoutWriter.Write"}, {"name": "chunkWriter.Write"}, {"name": "clientConnPool.GetClientConn"}, {"name": "gzipReader.Close"}, {"name": "gzipReader.Read"}, {"name": "noDialClientConnPool.GetClientConn"}, {"name": "priorityWriteSchedulerRFC9218.Pop"}, {"name": "requestBody.Close"}, {"name": "responseWriter.Flush"}, {"name": "responseWriter.FlushError"}, {"name": "responseWriter.Push"}, {"name": "responseWriter.Write"}, {"name": "responseWriter.WriteHeader"}, {"name": "responseWriter.WriteString"}, {"name": "roundRobinWriteScheduler.Pop"}, {"name": "serve400Handler.ServeHTTP"}, {"name": "serverConn.Flush"}, {"name": "stickyErrWriter.Write"}, {"name": "transportResponseBody.Close"}, {"name": "transportResponseBody.Read"}], "vendor": "Go standard library", "versions": [{"lessThan": "1.27.2", "status": "affected", "version": "1.27.0-0", "versionType": "semver"}]}, {"collectionURL": "https://pkg.go.dev", "defaultStatus": "unaffected", "packageName": "golang.org/x/net/http2", "product": "golang.org/x/net/http2", "programRoutines": [{"name": "outflow.add"}, {"name": "outflow.available"}, {"name": "outflow.setConnFlow"}, {"name": "outflow.take"}, {"name": "Server.serveConn"}, {"name": "serverConn.newStream"}, {"name": "serverConn.processSettingInitialWindowSize"}, {"name": "serverConn.processWindowUpdate"}, {"name": "serverConn.scheduleFrameWrite"}, {"name": "ClientConn.addStreamLocked"}, {"name": "Transport.newClientConn"}, {"name": "clientConnReadLoop.processSettingsNoWrite"}, {"name": "clientConnReadLoop.processWindowUpdate"}, {"name": "clientConnReadLoop.streamByID"}, {"name": "clientStream.awaitFlowControl"}, {"name": "clientStream.cleanupWriteRequest"}, {"name": "FrameWriteRequest.Consume"}, {"name": "ClientConn.Close"}, {"name": "ClientConn.Ping"}, {"name": "ClientConn.RoundTrip"}, {"name": "ClientConn.Shutdown"}, {"name": "ConfigureServer"}, {"name": "ConfigureTransport"}, {"name": "ConfigureTransports"}, {"name": "ConnectionError.Error"}, {"name": "ErrCode.String"}, {"name": "FrameHeader.String"}, {"name": "FrameType.String"}, {"name": "FrameWriteRequest.String"}, {"name": "Framer.ReadFrame"}, {"name": "Framer.ReadFrameForHeader"}, {"name": "Framer.ReadFrameHeader"}, {"name": "Framer.WriteContinuation"}, {"name": "Framer.WriteData"}, {"name": "Framer.WriteDataPadded"}, {"name": "Framer.WriteGoAway"}, {"name": "Framer.WriteHeaders"}, {"name": "Framer.WritePing"}, {"name": "Framer.WritePriority"}, {"name": "Framer.WritePriorityUpdate"}, {"name": "Framer.WritePushPromise"}, {"name": "Framer.WriteRSTStream"}, {"name": "Framer.WriteRawFrame"}, {"name": "Framer.WriteSettings"}, {"name": "Framer.WriteSettingsAck"}, {"name": "Framer.WriteWindowUpdate"}, {"name": "GoAwayError.Error"}, {"name": "ReadFrameHeader"}, {"name": "Server.ServeConn"}, {"name": "Setting.String"}, {"name": "SettingID.String"}, {"name": "SettingsFrame.ForeachSetting"}, {"name": "StreamError.Error"}, {"name": "Transport.CloseIdleConnections"}, {"name": "Transport.NewClientConn"}, {"name": "Transport.RoundTrip"}, {"name": "Transport.RoundTripOpt"}, {"name": "bufferedWriter.Flush"}, {"name": "bufferedWriter.Write"}, {"name": "bufferedWriterTimeoutWriter.Write"}, {"name": "chunkWriter.Write"}, {"name": "clientConnPool.GetClientConn"}, {"name": "connError.Error"}, {"name": "dataBuffer.Read"}, {"name": "duplicatePseudoHeaderError.Error"}, {"name": "gzipReader.Close"}, {"name": "gzipReader.Read"}, {"name": "headerFieldNameError.Error"}, {"name": "headerFieldValueError.Error"}, {"name": "netHTTPClientConn.Close"}, {"name": "netHTTPClientConn.RoundTrip"}, {"name": "noDialClientConnPool.GetClientConn"}, {"name": "noDialH2RoundTripper.NewClientConn"}, {"name": "noDialH2RoundTripper.RoundTrip"}, {"name": "pipe.Read"}, {"name": "priorityWriteSchedulerRFC7540.CloseStream"}, {"name": "priorityWriteSchedulerRFC7540.OpenStream"}, {"name": "priorityWriteSchedulerRFC7540.Pop"}, {"name": "priorityWriteSchedulerRFC9218.OpenStream"}, {"name": "priorityWriteSchedulerRFC9218.Pop"}, {"name": "pseudoHeaderError.Error"}, {"name": "randomWriteScheduler.Pop"}, {"name": "requestBody.Close"}, {"name": "requestBody.Read"}, {"name": "responseWriter.Flush"}, {"name": "responseWriter.FlushError"}, {"name": "responseWriter.Push"}, {"name": "responseWriter.SetReadDeadline"}, {"name": "responseWriter.SetWriteDeadline"}, {"name": "responseWriter.Write"}, {"name": "responseWriter.WriteHeader"}, {"name": "responseWriter.WriteString"}, {"name": "roundRobinWriteScheduler.OpenStream"}, {"name": "roundRobinWriteScheduler.Pop"}, {"name": "serverConn.CloseConn"}, {"name": "serverConn.Flush"}, {"name": "stickyErrWriter.Write"}, {"name": "transportResponseBody.Close"}, {"name": "transportResponseBody.Read"}, {"name": "unencryptedTransport.RoundTrip"}, {"name": "writeData.String"}], "vendor": "golang.org/x/net", "versions": [{"lessThan": "0.60.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@golang.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A malicious HTTP/2 peer can cause excessive CPU consumption in the client or server by opening a large number of streams and then sending many small SETTINGS frames containing SETTINGS_INITIAL_WINDOW_SIZE values."}], "id": "CVE-2026-78669", "lastModified": "2026-10-08T23:17:04.010", "metrics": {}, "published": "2026-10-08T23:17:04.010", "references": [{"source": "security@golang.org", "url": "https://go.dev/cl/847186"}, {"source": "security@golang.org", "url": "https://go.dev/cl/847308"}, {"source": "security@golang.org", "url": "https://go.dev/issue/81742"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}, {"source": "security@golang.org", "url": "https://groups.google.com/g/golang-announce/c/ZPwCyRUuGBs"}, {"source": "security@golang.org", "url": "https://pkg.go.dev/vuln/GO-2026-6611"}], "sourceIdentifier": "security@golang.org", "vulnStatus": "Received"}