UBUNTU-CVE-2026-54548

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Source
https://ubuntu.com/security/CVE-2026-54548
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54548.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54548
Upstream
Published
2026-08-26T15:16:00Z
Modified
2026-09-02T19:36:19Z
Severity
  • 3.3 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

kas is a setup tool for bitbake based projects. Prior to 5.4, internal SSH key setup triggered by SSH_PRIVATE_KEY or SSH_PRIVATE_KEY_FILE creates ~/.ssh/config when no user-specific SSH configuration exists and adds a global Host * rule containing StrictHostKeyChecking no. In kas/libcmds.py, ssh_no_host_key_check() runs without checking ctx.managed_env, so the setting persists after kas exits and affects future SSH sessions by the same local user, extending beyond the intended short-lived continuous integration environment. A later SSH connection can therefore accept an attacker-controlled host key without verification, increasing the risk of a man-in-the-middle attack that compromises session confidentiality or integrity. This issue is fixed in version 5.4.

References

Affected packages

Ubuntu:22.04:LTS / kas

Package

Name
kas
Purl
pkg:deb/ubuntu/kas?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.3.3-2
2.5-1
2.6.3-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kas",
            "binary_version": "2.6.3-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54548.json"

Ubuntu:24.04:LTS / kas

Package

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

Affected ranges

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

Affected versions

4.*
4.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kas",
            "binary_version": "4.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54548.json"

Ubuntu:25.10 / kas

Package

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

Affected ranges

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

Affected versions

4.*
4.7-1
4.8.1-1
4.8.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kas",
            "binary_version": "4.8.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54548.json"

Ubuntu:26.04:LTS / kas

Package

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

Affected ranges

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

Affected versions

4.*
4.8.1-2
5.*
5.0-1
5.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "kas",
            "binary_version": "5.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54548.json"