{"id":"DEBIAN-CVE-2026-54548","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.","modified":"2026-09-10T08:47:24.109242009Z","published":"2026-08-26T15:16:49.070Z","upstream":["CVE-2026-54548"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-54548"}],"affected":[{"package":{"name":"kas","ecosystem":"Debian:12","purl":"pkg:deb/debian/kas?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1-2","3.2.3-1","4.0-1","4.3-1","4.3.2-1","4.4-1","4.4-2","4.5-1","4.5-2","4.6-1","4.7-1","4.8.1-1","4.8.1-2","4.8.2-1","5.0-1","5.1-1","5.2-1","5.3-1","5.4-1","5.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54548.json"}},{"package":{"name":"kas","ecosystem":"Debian:13","purl":"pkg:deb/debian/kas?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.1-2","4.8.2-1","5.0-1","5.1-1","5.2-1","5.3-1","5.4-1","5.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54548.json"}},{"package":{"name":"kas","ecosystem":"Debian:14","purl":"pkg:deb/debian/kas?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4-1"}]}],"versions":["4.8.1-2","4.8.2-1","5.0-1","5.1-1","5.2-1","5.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-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"}]}