{"schema":"threatline.record/2","record":{"id":"CVE-2026-78660","aliases":[],"summary":"HTTP/2 transport accepts malformed framing-related headers in net/http","details":"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.","categories":["Unclassified"],"product":"net/http","vendor":"Go standard library","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","source_modified_at":"2026-10-09T16:23:56.092Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"net/http","vendor":"Go standard library","versions":[{"version":"0","lessThan":"1.26.9","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","source_modified_at":"2026-10-09T16:23:56.092Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"net/http/internal/http2","vendor":"Go standard library","versions":[{"version":"1.27.0-0","lessThan":"1.27.2","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","source_modified_at":"2026-10-09T16:23:56.092Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"golang.org/x/net/http2","vendor":"golang.org/x/net","versions":[{"version":"0","lessThan":"0.60.0","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","source_modified_at":"2026-10-09T16:23:56.092Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"net/http","ecosystem":null},"version":"1.26.9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","source_modified_at":"2026-10-09T16:23:56.092Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"net/http/internal/http2","ecosystem":null},"version":"1.27.2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","source_modified_at":"2026-10-09T16:23:56.092Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"golang.org/x/net/http2","ecosystem":null},"version":"0.60.0","basis":"first unaffected version stated in the CVE record"}],"cvss":7.5,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00303,"percentile":0.2187,"score_date":"2026-10-23"},"published_at":"2026-10-08T22:53:59.334Z","modified_at":"2026-10-09T16:23:56.092Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-78660","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-09T16:23:56.092Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-78660","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://go.dev/cl/835145"},{"source":"CVE List","url":"https://go.dev/cl/836385"},{"source":"CVE List","url":"https://go.dev/issue/81115"},{"source":"CVE List","url":"https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"},{"source":"CVE List","url":"https://pkg.go.dev/vuln/GO-2026-6610"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-09T16:21:51.217328Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-09T16:23:56.092Z","content_hash":"9a691a182ce926f1c2d0d7bfdcb0838cec52cedfb0941d4bd389b82bad789d6f"}}