{"cve":"CVE-2026-56862","nvd":{"published":"2026-08-13T22:17:22.550","modified":"2026-10-24T16:10:00.153","status":"Awaiting Analysis","description":"Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770"],"references":["https://go.dev/cl/804261","https://go.dev/issue/80528","https://groups.google.com/g/golang-announce/c/94pEornpRlI","https://pkg.go.dev/vuln/GO-2026-6090"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-56862","score":0.00568,"percentile":0.46789,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GO-2026-6090","url":"https://osv.dev/vulnerability/GO-2026-6090","summary":"Limit handshake messages we are willing to accept post-handshake in crypto/tls","modified":"2026-10-20T10:42:24.559672268Z","packages":[{"ecosystem":"Go","name":"stdlib","purl":"pkg:golang/stdlib","ranges":["<1.25.13",">=1.26.0-0 <1.26.6",">=1.27.0-0 <1.27.0-rc.3"],"fixed":["1.25.13","1.26.6","1.27.0-rc.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}