CVE-2026-11703
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk11th percentile — higher than 11% of all known CVEs
Summary
The vulnerability involves missing SNI/ALPN binding on stateful (session-ID) resumption, allowing a cached session to be resumed under a different SNI/ALPN than originally negotiated. Where client-authentication policy differs across virtual hosts, this could carry the cached peer-authentication state into an unintended context.
Risk Assessment
The risk is potential unauthorized access or bypass of client authentication policies when a TLS session is resumed in the context of a different virtual host.
Recommendation
It is recommended to immediately update to a software version that includes the fix enforcing SNI/ALPN binding verification on all resumption paths.
Original NVD description (English source)
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.