CVE-2026-84897 wolfSSH server accepts server-to-client DH group exchange messages from an unauthenticated client, causing pre-authentication primality-test CPU exhaustion and key exchange role confusion

src/internal.c in wolfSSL wolfSSH through 1.5.0 admits the server-to-client Diffie-Hellman group exchange messages SSHMSGKEXDHGEXGROUP 31 and SSHMSGKEXDHGEXREPLY 33 when a server receives them from an unauthenticated client. IsMessageAllowedServer applies no direction check to the key exchange...

CVE-2026-84897

The wolfSSH server (through version 1.5.0 ) is vulnerable to CPU exhaustion and key exchange role confusion because it improperly admits server-to-client Diffie-Hellman group exchange messages from unauthenticated clients. Due to a missing direction check in IsMessageAllowedServer(), the server m...

EUVD-2026-94165

src/internal.c in wolfSSL wolfSSH through 1.5.0 admits the server-to-client Diffie-Hellman group exchange messages SSHMSGKEXDHGEXGROUP 31 and SSHMSGKEXDHGEXREPLY 33 when a server receives them from an unauthenticated client. IsMessageAllowedServer applies no direction check to the key exchange...