What is CVE-2026-56862?
CVE-2026-56862 is a vulnerability where TLS `KeyUpdate` messages are always treated as state-advancing, even when the handshake is incomplete. This allows a malicious client to force the server into endless key derivation operations by sending continuous `KeyUpdate` messages. TLS servers are affected; patching or monitoring for abnormal `KeyUpdate` traffic is recommended.
Azərbaycanca: CVE-2026-56862, TLS handshake protokolunda `KeyUpdate` mesajlarının həmişə həssaslıq yaradan əməliyyat kimi qəbul edilməsi ilə bağlı zəiflikdir. Bu, hücumçunun serverə sonsuz `KeyUpdate` mesajı göndərərək açar törəmə (key derivation) əməliyyatlarını davamlı icra etdirməsinə səbəb olur. TLS istifadə edən serverlər bu hücuma qarşı həssasdır; yamaq tətbiq edilməli və ya anormal `KeyUpdate` trafiki monitorinq olunmalıdır.
FAQ2
How does CVE-2026-56862 cause resource exhaustion on a TLS server?
Even when the TLS handshake is incomplete, `KeyUpdate` messages are always treated as state-advancing operations. This allows an attacker to force the server into endless key derivation by sending continuous `KeyUpdate` messages.
What measures are recommended to protect against CVE-2026-56862?
TLS servers should be patched, and additionally, abnormal `KeyUpdate` traffic should be monitored.
See also6
This explainer is AI-written from source data — skopnix's own reporting on this CVE; CVSS scores, vendors and versions are never invented. See NVD for the official record.