VULNERABILITY INTELLIGENCE

CVE-2026-56855

CVSS score7.5 HIGH
EPSS probability0.50%
CISA KEVNot currently listed
Published2026-09-02
Last modified2026-09-04
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-770

Primary references