{"id":"CVE-2026-56853","revision":"e986eeac705e430e99ef7a283ec88e14","records":[{"revision":"e986eeac705e430e99ef7a283ec88e14","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-56853","aliases":[],"title":"Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http","description":"When a server is configured to support unencrypted HTTP/2, it reads a few bytes from each new connection to see if they contain the HTTP/2 client preface. ReadHeaderTimeout is unexpectedly not being applied when doing this.","state":0,"publishedAt":"2026-08-13T21:58:53.092+00:00","modifiedAt":"2026-08-14T15:23:18.68+00:00","affected":[{"ecosystem":"https://pkg.go.dev","name":"net/http","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Go standard library\",\n                    \"product\": \"net/http\",\n                    \"collectionURL\": \"https://pkg.go.dev\",\n                    \"packageName\": \"net/http\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"1.25.13\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"1.26.0-0\",\n                            \"lessThan\": \"1.26.6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"1.27.0-0\",\n                            \"lessThan\": \"1.27.0-rc.3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"conn.readRequest\"\n                        },\n                        {\n                            \"name\": \"conn.serve\"\n                        },\n                        {\n                            \"name\": \"ListenAndServe\"\n                        },\n                        {\n                            \"name\": \"ListenAndServeTLS\"\n                        },\n                        {\n                            \"name\": \"Serve\"\n                        },\n                        {\n                            \"name\": \"ServeTLS\"\n                        },\n                        {\n                            \"name\": \"Server.ListenAndServe\"\n                        },\n                        {\n                            \"name\": \"Server.ListenAndServeTLS\"\n                        },\n                        {\n                            \"name\": \"Server.Serve\"\n                        },\n                        {\n                            \"name\": \"Server.ServeTLS\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[],"references":["https://go.dev/issue/80205","https://go.dev/cl/795540","https://groups.google.com/g/golang-announce/c/94pEornpRlI","https://pkg.go.dev/vuln/GO-2026-6089"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56853","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-56853","identifiers":["CVE-2026-56853"]},"retained":false,"historicalAffected":[]}],"coverage":[]}