Low [CVE-2026-59849] denial of service via automatic certificate authentication loop
This low-severity Red Hat Linux advisory covers CVE-2026-59849 affecting Red Hat Enterprise Linux 10, Red Hat Hardened Images, Red Hat package: libssh.
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Summary
A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.
Red Hat severity: Low — CVSS 3.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-835.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Hardened Images. Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Red Hat fixing advisory: RHSA-2026:55855, RHSA-2026:42922.
Affected products named by the advisory: Red Hat package: libssh.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
- libssh-0:0.12.0-3.el10_2
- libssh-main-0.12.1-4.hum1
- RHSA-2026:55855
- RHSA-2026:42922
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
Mitigation checklist
- Do not connect to untrusted SSH servers and do not use certificates until patched.
Official advisory · high-confidence parse· fetched 8 days ago·verify at source
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