Resource exhaustion in Red Hat Enterprise Linux 10

CVE-2026-59843

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.

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-59843?
CVE-2026-59843 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-21.
How severe is CVE-2026-59843?
Medium severity. CVSS v3 base score is 6.5 out of 10.