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.
History

Tue, 22 Sep 2026 20:00:00 +0000

Type Values Removed Values Added
First Time appeared Redhat enterprise Linux For Els
Redhat enterprise Linux For Eus
Redhat enterprise Linux For Ibm Z Systems
Redhat enterprise Linux For Ibm Z Systems Els
Redhat enterprise Linux For Ibm Z Systems Eus
Redhat enterprise Linux For Power Little Endian
Redhat enterprise Linux For Power Little Endian Els
Redhat enterprise Linux For Power Little Endian Eus
CPEs cpe:2.3:a:libssh:libssh:-:*:*:*:*:*:*:* cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:*
cpe:2.3:a:libssh:libssh:0.12.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:arm64:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:x64:*
cpe:2.3:o:redhat:enterprise_linux:10.2:*:*:*:*:*:arm64:*
cpe:2.3:o:redhat:enterprise_linux:10.2:*:*:*:*:*:x64:*
cpe:2.3:o:redhat:enterprise_linux_for_els:10.2:*:*:*:*:*:arm64:*
cpe:2.3:o:redhat:enterprise_linux_for_els:10.2:*:*:*:*:*:x64:*
cpe:2.3:o:redhat:enterprise_linux_for_eus:10.2:*:*:*:*:*:arm64:*
cpe:2.3:o:redhat:enterprise_linux_for_eus:10.2:*:*:*:*:*:x64:*
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:10.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_els:10.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:10.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:10.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:10.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_els:10.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:10.2:*:*:*:*:*:*:*
Vendors & Products Redhat enterprise Linux For Els
Redhat enterprise Linux For Eus
Redhat enterprise Linux For Ibm Z Systems
Redhat enterprise Linux For Ibm Z Systems Els
Redhat enterprise Linux For Ibm Z Systems Eus
Redhat enterprise Linux For Power Little Endian
Redhat enterprise Linux For Power Little Endian Els
Redhat enterprise Linux For Power Little Endian Eus

Wed, 19 Aug 2026 05:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:10 cpe:/o:redhat:enterprise_linux:10.2
References

Mon, 27 Jul 2026 23:30:00 +0000

Type Values Removed Values Added
First Time appeared Libssh
Libssh libssh
Redhat hardened Images
Vendors & Products Libssh
Libssh libssh
Redhat hardened Images

Wed, 22 Jul 2026 20:00:00 +0000

Type Values Removed Values Added
References

Wed, 22 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 22 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Tue, 21 Jul 2026 14:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Libssh: libssh: denial of service via automatic certificate authentication loop
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
Weaknesses CWE-835
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat hummingbird
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-07-21T14:08:15.016Z

Updated: 2026-08-19T04:57:42.066Z

Reserved: 2026-07-07T15:40:24.561Z

Link: CVE-2026-59849

cve-icon Vulnrichment

Updated: 2026-07-22T14:31:09.232Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-21T15:16:37.647

Modified: 2026-09-22T19:48:05.513

Link: CVE-2026-59849

cve-icon Redhat

Severity : Low

Publid Date: 2026-07-21T14:03:21Z

Links: CVE-2026-59849 - Bugzilla