{"id":"GO-2026-6610","aliases":["BIT-golang-2026-78660","CVE-2026-78660"],"title":"HTTP/2 transport accepts malformed framing-related headers in net/http","titleSource":"OSV","descriptionSource":"OSV","description":"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.","severity":"unknown","score":null,"published":"2026-10-08T22:31:09.000Z","modified":"2026-11-14T13:12:14.502Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-6610","url":"https://osv.dev/vulnerability/GO-2026-6610"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.26.9"}],"type":"SEMVER"}],"versions":[],"fixed":["1.26.9"]},{"ecosystem":"Go","name":"stdlib","sources":[{"name":"OSV · GO-2026-6610","url":"https://osv.dev/vulnerability/GO-2026-6610"}],"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-2026-6610","url":"https://osv.dev/vulnerability/GO-2026-6610"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"0.60.0"}],"type":"SEMVER"}],"versions":[],"fixed":["0.60.0"]}],"sourceAffected":[],"references":["https://go.dev/cl/835145","https://go.dev/cl/836385","https://go.dev/issue/81115","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"],"sources":[{"name":"OSV","id":"GO-2026-6610","modified":"2026-11-14T13:12:14.502576208Z","url":"https://osv.dev/vulnerability/GO-2026-6610"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:05:37.863Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:05:31.807Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T01:05:33.705Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-11-14T01:00:33.303Z","attemptedAt":"2026-11-14T01:00:33.303Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T01:00:33.012Z","attemptedAt":"2026-11-14T01:00:33.012Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T01:00:33.012Z","attemptedAt":"2026-11-14T01:00:33.012Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-95425","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95425","modified":"Oct 9, 2026, 4:23:56 PM","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","checkedAt":"2026-11-14T01:00:33.012Z"},{"source":"FIRST EPSS","id":"CVE-2026-78660","url":"https://www.first.org/epss/","probability":0.00542,"percentile":0.46134,"date":"2026-11-13","checkedAt":"2026-11-14T01:00:33.012Z"}],"aiSummary":null}