Vulnerability 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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294
- https://github.com/siemens/kas/releases/tag/5.4
- https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94
FAQ
What is CVE-2026-54548?
CVE-2026-54548 is a vulnerability with a CVSS score of 3.3 (LOW). 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 ...
How severe is CVE-2026-54548?
CVE-2026-54548 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54548?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.