LibreSSL. Multiple issues were addressed by updating to libressl version 2.6.4.

A double free or use after free could occur after SSLclear in OpenBSD 7.2 before errata 026 and 7.3 before errata 004, and in LibreSSL before 3.6.3 and 3.7.x before 3.7.3. NOTE: OpenSSL is not affected.

Double free vulnerability in the sslparseclienthellousesrtpext function in d1srtp.c in LibreSSL before 2.1.2 allows remote attackers to cause a denial of service or possibly have unspecified other impact by triggering a certain length-verification error during processing of a DTLS handshake.

LibreSSL. Multiple issues were addressed by updating to libressl version 2.6.4.

The intx509paramsethosts function in lib/libcrypto/x509/x509vpm.c in LibreSSL 2.7.0 before 2.7.1 does not support a certain special case of a zero name length, which causes silent omission of hostname verification, and consequently allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate. NOTE: the LibreSSL documentation indicates that this special case is supported, but the BoringSSL documentation does not.

x509constraintsparsemailbox in lib/libcrypto/x509/x509constraints.c in LibreSSL through 3.4.0 has a stack-based buffer over-read. When the input exceeds DOMAINPARTMAXLEN, the buffer lacks '\0' termination.

LibreSSL 2.5.1 to 2.5.3 lacks TLS certificate verification if SSLgetverifyresult is relied upon for a later check of a verification result, in a use case where a user-provided verification callback returns 1, as demonstrated by acceptance of invalid certificates by nginx.