CVE-2026-56862 — Limit handshake messages we are willing to accept post-handshake in crypto/tls
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…
Published: 2026-08-13 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7