Libssh: libssh: denial of service via zero advertised channel packet size
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 0.7%
exploitation probability
0.7%top 48% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
Red Hat · Red Hat Enterprise Linux 10Red Hat · Red Hat Enterprise Linux 8Red Hat · Red Hat Enterprise Linux 9Red Hat · Red Hat Hardened ImagesReferences
https://access.redhat.com/errata/RHSA-2026:42922https://access.redhat.com/errata/RHSA-2026:55855https://access.redhat.com/errata/RHSA-2026:62217https://access.redhat.com/errata/RHSA-2026:62218https://access.redhat.com/security/cve/CVE-2026-59843https://bugzilla.redhat.com/show_bug.cgi?id=2498176