{"id":"GO-2026-6611","aliases":["BIT-golang-2026-78669","CVE-2026-78669"],"title":"Excessive CPU consumption from repeated initial window changes in net/http","titleSource":"OSV","descriptionSource":"OSV","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.","severity":"unknown","score":null,"published":"2026-10-08T22:31:09.000Z","modified":"2026-11-14T13:12:14.349Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-6611","url":"https://osv.dev/vulnerability/GO-2026-6611"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.26.9"}],"type":"SEMVER"}],"versions":[],"fixed":["1.26.9"]},{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-6611","url":"https://osv.dev/vulnerability/GO-2026-6611"}],"ranges":[{"events":[{"introduced":"1.27.0-0"},{"fixed":"1.27.2"}],"type":"SEMVER"}],"versions":[],"fixed":["1.27.2"]},{"ecosystem":"Go","name":"golang.org/x/net","sources":[{"name":"OSV · GO-2026-6611","url":"https://osv.dev/vulnerability/GO-2026-6611"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"0.60.0"}],"type":"SEMVER"}],"versions":[],"fixed":["0.60.0"]}],"sourceAffected":[],"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"],"sources":[{"name":"OSV","id":"GO-2026-6611","modified":"2026-11-14T13:12:14.349122729Z","url":"https://osv.dev/vulnerability/GO-2026-6611"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:05:14.647Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:50:31.401Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T00:50:58.382Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-14T00:45:32.890Z","attemptedAt":"2026-11-14T00:45:32.890Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T00:45:32.883Z","attemptedAt":"2026-11-14T00:45:32.883Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T00:45:32.890Z","attemptedAt":"2026-11-14T00:45:32.890Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-95426","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95426","modified":"Oct 9, 2026, 4:32:57 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":"2026-11-14T00:45:32.883Z"},{"source":"FIRST EPSS","id":"CVE-2026-78669","url":"https://www.first.org/epss/","probability":0.00847,"percentile":0.58632,"date":"2026-11-13","checkedAt":"2026-11-14T00:45:32.890Z"}],"aiSummary":null}