CVE-2026-11703 – Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption

CVE ID :CVE-2026-11703

Published : June 25, 2026, 9:15 p.m. | 29 minutes ago

Description :Missing SNI/ALPN binding on stateful (session-ID) resumption, which previously skipped the binding check performed for ticket-based resumption. A cached session could be resumed under a different SNI/ALPN than originally negotiated and, where client-authentication policy differs across virtual hosts, carry the cached peer-authentication state into a context it was not established for. Resumption now verifies the SNI/ALPN binding for all paths and declines (falling back to a full handshake) on mismatch.

Severity: 6.0 | MEDIUM

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