CVE-2022-4203

A read buffer overrun can be triggered in X.509 certificate verification,
specifically in name constraint checking. Note that this occurs after
certificate chain signature verification and requires either a CA to have
signed the malicious certificate or for the application to continue
certificate verification despite failure to construct a path to a trusted
issuer. The read buffer overrun might result in a crash which could lead to
a denial of service attack. In theory it could also result in the
disclosure of private memory contents (such as private keys, or sensitive
plaintext) although we are not aware of any working exploit leading to
memory contents disclosure as of the time of release of this advisory. In a
TLS client, this can be triggered by connecting to a malicious server. In a
TLS server, this can be triggered if the server requests client
authentication and a malicious client connects.

Notes