UBUNTU-CVE-2026-55654

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Source
https://ubuntu.com/security/CVE-2026-55654
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-55654
Upstream
Published
2026-06-23T04:17:00Z
Modified
2026-09-11T20:51:50Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.

References

Affected packages

Ubuntu:18.04:LTS
openssh-ssh1

Package

Name
openssh-ssh1
Purl
pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:7.*
1:7.5p1-8
1:7.5p1-9
1:7.5p1-9build1
1:7.5p1-10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.5p1-10"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"
Ubuntu:20.04:LTS
openssh-ssh1

Package

Name
openssh-ssh1
Purl
pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:7.*
1:7.5p1-11build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.5p1-11build1"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"
Ubuntu:22.04:LTS
openssh-ssh1

Package

Name
openssh-ssh1
Purl
pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:7.*
1:7.5p1-12
1:7.5p1-12build1
1:7.5p1-13

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.5p1-13"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"
Ubuntu:24.04:LTS
openssh-ssh1

Package

Name
openssh-ssh1
Purl
pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:7.*
1:7.5p1-14
1:7.5p1-15
1:7.5p1-15build1
1:7.5p1-16

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.5p1-16"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"
Ubuntu:25.10
openssh

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:9.*
1:9.9p1-3ubuntu3
1:9.9p1-3ubuntu3.1
1:10.*
1:10.0p1-5ubuntu2
1:10.0p1-5ubuntu3
1:10.0p1-5ubuntu4
1:10.0p1-5ubuntu5
1:10.0p1-5ubuntu5.1
1:10.0p1-5ubuntu5.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "openssh-client-gssapi",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "openssh-server",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "openssh-server-gssapi",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "openssh-sftp-server",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "openssh-tests",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "ssh",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        },
        {
            "binary_name": "ssh-askpass-gnome",
            "binary_version": "1:10.0p1-5ubuntu5.4"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"
openssh-ssh1

Package

Name
openssh-ssh1
Purl
pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:7.*
1:7.5p1-17

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.5p1-17"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"
Ubuntu:26.04:LTS
openssh-ssh1

Package

Name
openssh-ssh1
Purl
pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:7.*
1:7.5p1-17
1:7.5p1-18

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "openssh-client-ssh1",
            "binary_version": "1:7.5p1-18"
        }
    ],
    "priority_reason": "This is a low severity issue"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-55654.json"