A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service.
Advisories
Source ID Title
Debian DSA Debian DSA DSA-6410-1 libssh security update
Ubuntu USN Ubuntu USN USN-8699-1 libssh vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

Do not connect to untrusted SFTP servers.

History

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
cpe:/a:redhat:enterprise_linux:8::appstream
cpe:/a:redhat:enterprise_linux:9::appstream
cpe:/o:redhat:enterprise_linux:8::baseos
cpe:/o:redhat:enterprise_linux:9::baseos
References

Mon, 17 Aug 2026 22:00:00 +0000

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

Wed, 29 Jul 2026 00:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
CWE-627

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

Fri, 24 Jul 2026 04:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400
CWE-627

Thu, 23 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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

Type Values Removed Values Added
References

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

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


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

Type Values Removed Values Added
Description A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service.
Title Libssh: libssh: denial of service via sftp responses with unknown request ids
First Time appeared Redhat
Redhat enterprise Linux
Redhat hummingbird
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': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-01T20:01:22.011Z

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

Link: CVE-2026-59848

cve-icon Vulnrichment

Updated: 2026-07-23T14:28:19.387Z

cve-icon NVD

Status : Modified

Published: 2026-07-21T14:16:34.790

Modified: 2026-09-01T21:18:35.010

Link: CVE-2026-59848

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-21T13:18:03Z

Links: CVE-2026-59848 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T00:45:03Z

Weaknesses