Vulnerability Details CVE-2026-56855
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 connection down instead of buffering and blocking.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 6.7%
CVSS Severity
CVSS v3 Score 7.5