Security Bulletin: IBM MQ Appliance is affected by a stack buffer overflow vulnerability (CVE-2026-12665)

Summary IBM MQ Appliance has addressed a stack buffer overflow vulnerability that could allow an unauthenticated attacker to execute arbitrary code when processing TLS certificates with malformed distinguished names during channel connection establishment. Vulnerability Details CVEID:CVE-2026-126...

PT-2026-90757

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connectio...