A flaw was found in libssh. If data packets are processed after a channel is closed, channel data callbacks can be invoked after the associated data has already been freed, leading to crashes or possible use-after-free conditions.
https://access.redhat.com/errata/RHSA-2026:62218
https://access.redhat.com/errata/RHSA-2026:62217
https://access.redhat.com/errata/RHSA-2026:55855
https://access.redhat.com/errata/RHSA-2026:42922
https://bugzilla.redhat.com/show_bug.cgi?id=2498183
https://access.redhat.com/security/cve/CVE-2026-59850
Source: Mitre, NVD
Published: 2026-07-21
Updated: 2026-09-01
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C
Severity: High
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.00255