PT-2026-61858 · Red Hat · Red Hat Enterprise Linux 10+3

CVE-2026-59843 · Published 2026-07-21 · Updated 2026-07-21

Mitre

CVSS v3.1

6.5

Medium

Base vector

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

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.

Fix

Related Identifiers

CVE-2026-59843

Affected Products

Red Hat Enterprise Linux 10

Red Hat Enterprise Linux 8

Red Hat Enterprise Linux 9

Red Hat Hardened Images

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-59843 · Security Note
• https://access.redhat.com/security/cve/CVE-2026-59843 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2498176 · Note