CVE-2026-59843

Published: Jul 21, 2026Modified: Jul 21, 2026

6.5

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploitability: 2.8 / Impact: 3.6

Source: secalert@redhat.com (Secondary)

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.

Related CWEs

CWE-400

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References (2)

https://access.redhat.com/security/cve/CVE-2026-59843

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2498176

Source: secalert@redhat.com

Timeline

No history available yet.