Security Advisory
CVE-2026-56862
7.5
HIGH
Vulnerability 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.
Published Date
August 13, 2026
Official Source
NIST NVD Advisory