{"id":"GO-2026-6089","aliases":["BIT-golang-2026-56853","CVE-2026-56853"],"title":"Apply ReadHeaderTimeout when doing unencrypted HTTP/2 check in net/http","titleSource":"OSV","descriptionSource":"OSV","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this.","severity":"unknown","score":null,"published":"2026-08-13T21:43:54.000Z","modified":"2026-11-14T13:12:14.846Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-6089","url":"https://osv.dev/vulnerability/GO-2026-6089"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.25.13"},{"introduced":"1.26.0-0"},{"fixed":"1.26.6"},{"introduced":"1.27.0-0"},{"fixed":"1.27.0-rc.3"}],"type":"SEMVER"}],"versions":[],"fixed":["1.25.13","1.26.6","1.27.0-rc.3"]}],"sourceAffected":[],"references":["https://go.dev/issue/80205","https://go.dev/cl/795540","https://groups.google.com/g/golang-announce/c/94pEornpRlI"],"sources":[{"name":"OSV","id":"GO-2026-6089","modified":"2026-11-14T13:12:14.846515619Z","url":"https://osv.dev/vulnerability/GO-2026-6089"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:05:40.412Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T03:40:34.262Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-11-14T01:10:32.001Z","attemptedAt":"2026-11-14T01:10:32.001Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T01:00:36.826Z","attemptedAt":"2026-11-14T01:00:36.826Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T01:00:37.830Z","attemptedAt":"2026-11-14T01:00:37.830Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T01:00:35.754Z","attemptedAt":"2026-11-14T01:00:35.754Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-56853","url":"https://www.first.org/epss/","probability":0.00568,"percentile":0.4762,"date":"2026-11-13","checkedAt":"2026-11-14T01:00:35.754Z"},{"source":"GitHub Advisory Database","id":"GHSA-xphw-4f88-5f39","url":"https://github.com/advisories/GHSA-xphw-4f88-5f39","modified":"2026-08-14T18:31:34Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T01:00:36.826Z"},{"source":"ENISA EUVD","id":"EUVD-2026-58510","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-58510","modified":"Aug 14, 2026, 3:23:18 PM","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T01:00:37.830Z"},{"source":"NVD","id":"CVE-2026-56853","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56853","modified":"2026-09-03T16:37:52.170","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-11-14T01:10:32.001Z"}],"aiSummary":null}