CVE-2026-103415
When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without checking that the coo
CVSS
—
Sin CVSS
EPSS
—
KEV
—
Exploit Today
0
0-100
Publicado: 14 oct 2026 · Última mod.: 14 oct 2026 · CWE-787
Sin historial EPSS suficiente todavía.
When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without checking that the cookie fits in the outgoing packet. Both the length and the contents of that cookie come from the peer, and the write happens before certificate authentication completes, so a malicious or compromised server can overwrite memory past the caller supplied TLS packet buffer without presenting a certificate. Only the client path is affected.