CVE-2026-59843

MEDIUM CVSS 6.5 View on NVD ↗

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.

CVSS Vector

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

References

https://access.redhat.com/security/cve/CVE-2026-59843
https://bugzilla.redhat.com/show_bug.cgi?id=2498176

Published: Jul 21, 2026 12:18 UTC Modified: Jul 21, 2026 18:31 UTC