UBUNTU-CVE-2026-59849

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Source
https://ubuntu.com/security/CVE-2026-59849
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59849.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-59849
Upstream
  • CVE-2026-59849
Downstream
Related
Published
2026-07-21T15:16:00Z
Modified
2026-08-31T17:16:50Z
Severity
  • 3.1 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:26.04:LTS / libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.11.3-1ubuntu2.1

Affected versions

0.*
0.11.2-1build1
0.11.3-1
0.11.3-1ubuntu1
0.11.3-1ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.11.3-1ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-59849.json"