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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Red Hat Red Hat Enterprise Linux 10
Default version status: affected
0:0.12.0-3.el10_2 to < *unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: affected
0:0.9.6-17.el8_10 to < *unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: affected
0:0.9.6-17.el8_10 to < *unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: affected
0:0.10.4-19.el9_8 to < *unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: affected
0:0.10.4-19.el9_8 to < *unaffected
Red Hat Red Hat Hardened Images
Default version status: affected
0.12.1-4.hum1 to < *unaffected
References
- https://access.redhat.com/errata/RHSA-2026:42922 ↗
- https://access.redhat.com/errata/RHSA-2026:55855 ↗
- https://access.redhat.com/errata/RHSA-2026:62217 ↗
- https://access.redhat.com/errata/RHSA-2026:62218 ↗
- https://access.redhat.com/security/cve/CVE-2026-59843 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2498176 ↗