---
title: "CVE-2026-54548\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-54548?format=md
keywords: index, follow
---

# CVE-2026-54548

Publication date 26 August 2026

Last updated 2 September 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**3.3 · Low**

[Score breakdown](https://ubuntu.com/security/CVE-2026-54548?format=md#impact-score)

Toggle side navigation

## Description

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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| kas | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

3.3 · Low

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Local |
  | Attack complexity | High |
  | Privileges required | Low |
  | User interaction | Required |
  | Scope | Unchanged |
  | Confidentiality impact | Low |
  | Integrity impact | Low |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 3.3 · Low |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-54548)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-54548)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-54548)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-54548)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-54548>
* <https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94>