{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-78660",
        "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "state": "PUBLISHED",
        "assignerShortName": "Go",
        "dateReserved": "2026-08-24T23:36:15.738Z",
        "datePublished": "2026-10-08T22:53:59.334Z",
        "dateUpdated": "2026-10-09T16:23:56.092Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
                "shortName": "Go",
                "dateUpdated": "2026-10-08T22:53:59.334Z"
            },
            "title": "HTTP/2 transport accepts malformed framing-related headers in net/http",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling."
                }
            ],
            "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"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "http2clientConnReadLoop.handleResponse"
                        },
                        {
                            "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"
                },
                {
                    "vendor": "Go standard library",
                    "product": "net/http/internal/http2",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "net/http/internal/http2",
                    "versions": [
                        {
                            "version": "1.27.0-0",
                            "lessThan": "1.27.2",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "clientConnReadLoop.handleResponse"
                        },
                        {
                            "name": "Transport.AddConn"
                        },
                        {
                            "name": "Transport.NewClientConn"
                        },
                        {
                            "name": "Transport.RoundTrip"
                        },
                        {
                            "name": "Transport.RoundTripOpt"
                        },
                        {
                            "name": "clientConnPool.GetClientConn"
                        },
                        {
                            "name": "noDialClientConnPool.GetClientConn"
                        }
                    ],
                    "defaultStatus": "unaffected"
                },
                {
                    "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": "0.60.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "clientConnReadLoop.handleResponse"
                        },
                        {
                            "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"
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://go.dev/cl/835145"
                },
                {
                    "url": "https://go.dev/cl/836385"
                },
                {
                    "url": "https://go.dev/issue/81115"
                },
                {
                    "url": "https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"
                },
                {
                    "url": "https://pkg.go.dev/vuln/GO-2026-6610"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "TJ Barton"
                }
            ]
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-444",
                                "lang": "en",
                                "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 7.5,
                            "attackVector": "NETWORK",
                            "baseSeverity": "HIGH",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "NONE",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-09T16:21:51.217328Z",
                                "id": "CVE-2026-78660",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-09T16:23:56.092Z"
                }
            }
        ]
    }
}