VULNERABILITY INTELLIGENCE

CVE-2026-59843

CVSS score6.5 MEDIUM
EPSS probability0.57%
CISA KEVNot currently listed
Published2026-07-21
Last modified2026-09-01
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.

Weakness classification

  • secalert@redhat.com: CWE-835
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-400

Primary references