CVE-2026-11703 Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption
Attackers can bypass authentication checks by resuming TLS sessions across different virtual hosts with differing client-authentication policies.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-11703?
CVE-2026-11703 is a medium-severity authentication bypass vulnerability in Wolfssl Wolfssl, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-11703?
It affects 1 product.
Products include Wolfssl Wolfssl.
How do I fix CVE-2026-11703?
Apply the vendor's patch.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-11703 being exploited?
There is no known exploitation of CVE-2026-11703 in the wild and no public exploit code.
Other vulnerabilities in Wolfssl Wolfssl
Sources
Also known as DEBIAN-CVE-2026-11703, GHSA-q3px-vrjj-4f97, JLSEC-2026-698, UBUNTU-CVE-2026-11703.