USN-8309-1

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Source
https://ubuntu.com/security/notices/USN-8309-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8309-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8309-1
Upstream
Related
Published
2026-05-26T18:27:23Z
Modified
2026-05-26T20:14:13.837714643Z
Summary
libssh2 vulnerability
Details

It was discovered that libssh2 incorrectly handled username and password length values during SSH password authentication. A remote attacker could possibly use this issue to cause a denial of service.

References

Affected packages

Ubuntu:24.04:LTS / libssh2

Package

Name
libssh2
Purl
pkg:deb/ubuntu/libssh2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.11.0-4.1ubuntu0.24.04.1

Affected versions

1.*
1.11.0-2
1.11.0-3
1.11.0-4
1.11.0-4.1build1
1.11.0-4.1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh2-1t64",
            "binary_version": "1.11.0-4.1ubuntu0.24.04.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-7598",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8309-1.json"

Ubuntu:25.10 / libssh2

Package

Name
libssh2
Purl
pkg:deb/ubuntu/libssh2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.11.1-1ubuntu0.25.10.1

Affected versions

1.*
1.11.1-1
1.11.1-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh2-1t64",
            "binary_version": "1.11.1-1ubuntu0.25.10.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-7598",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:25.10"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8309-1.json"

Ubuntu:26.04:LTS / libssh2

Package

Name
libssh2
Purl
pkg:deb/ubuntu/libssh2?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.11.1-1ubuntu0.26.04.1

Affected versions

1.*
1.11.1-1build1
1.11.1-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libssh2-1t64",
            "binary_version": "1.11.1-1ubuntu0.26.04.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-7598",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
                    "type": "CVSS_V4"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8309-1.json"