{"id":"CVE-2026-54548","summary":"kas: Persistent SSH Host Key Checking Disablement","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.","aliases":["GHSA-mv8m-v9v6-5f94"],"modified":"2026-08-28T11:47:27.036761988Z","published":"2026-08-26T14:17:32.620Z","database_specific":{"cwe_ids":["CWE-295"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54548.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/siemens/kas/releases/tag/5.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54548.json"},{"type":"ADVISORY","url":"https://github.com/siemens/kas/security/advisories/GHSA-mv8m-v9v6-5f94"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54548"},{"type":"FIX","url":"https://github.com/siemens/kas/commit/1c1e861c9f241ce082b86bef6bedc7da9b676294"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/siemens/kas","events":[{"introduced":"0"},{"fixed":"1c1e861c9f241ce082b86bef6bedc7da9b676294"},{"fixed":"81bab5294be29de4b64adedce962d36184bfc66f"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"5.4"}]}}],"versions":["5.3","5.2","5.1","5.0","4.8.2","4.8.1","4.8","4.7","4.6","4.5","4.4","4.3.2","4.3.1","4.3","4.2","4.1","4.0","3.3","3.2.3","3.2.2","3.2.1","3.2","3.1","3.0.2","3.0.1","3.0","2.6.3","2.6.2","2.6.1","2.6","2.5","2.4","2.3.3","2.3.2","2.3.1","2.3","2.2","2.1.1","2.1","2.0","1.1","1.0","0.20.1","0.20.0","0.19.0","0.18.0","0.17.0","0.16.1","0.16.0","0.15.0","0.14.0","0.13.0","0.12.0","0.11.0","0.10.0","0.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54548.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N"}]}