{"id":"DEBIAN-CVE-2026-109399","details":"SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.","modified":"2026-10-13T17:00:10.521550244Z","published":"2026-10-12T16:17:05.557Z","upstream":["CVE-2026-109399"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-109399"}],"affected":[{"package":{"name":"swupdate","ecosystem":"Debian:12","purl":"pkg:deb/debian/swupdate?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2022.12+dfsg-4","2022.12+dfsg-4+deb12u1","2022.12+dfsg-4+deb12u1~bpo11+1","2022.12+dfsg-4+deb12u2","2023.05+dfsg-1","2023.05+dfsg-2","2023.05+dfsg-2~bpo12+1","2023.05+dfsg-3","2023.05+dfsg-4","2023.05+dfsg-5","2023.05+dfsg-5~bpo12+1","2023.12+dfsg-1","2023.12+dfsg-1~bpo12+1","2023.12.1+dfsg-1","2023.12.1+dfsg-1~bpo12+1","2023.12.1+dfsg-2","2023.12.1+dfsg-2~bpo12+1","2024.05+dfsg-1","2024.05.2+dfsg-1","2024.05.2+dfsg-2","2024.05.2+dfsg-2~bpo12+1","2024.12+dfsg-1","2024.12+dfsg-2","2024.12+dfsg-2~bpo12+1","2024.12.1+dfsg-1","2024.12.1+dfsg-1~bpo12+1","2024.12.1+dfsg-2","2024.12.1+dfsg-3","2024.12.1+dfsg-3~bpo12+1","2025.05+dfsg-1","2025.05+dfsg-2","2025.05+dfsg-2~bpo13+1","2025.05+dfsg-3","2025.05+dfsg-3~bpo13+1","2025.12+dfsg-1","2025.12+dfsg-10","2025.12+dfsg-10~bpo13+1","2025.12+dfsg-10~bpo13+2","2025.12+dfsg-2","2025.12+dfsg-2~bpo13+1","2025.12+dfsg-3","2025.12+dfsg-4","2025.12+dfsg-5","2025.12+dfsg-6","2025.12+dfsg-7","2025.12+dfsg-7~bpo13+1","2025.12+dfsg-8","2025.12+dfsg-9","2026.05+dfsg-1","2026.05+dfsg-2","2026.05+dfsg-3","2026.05+dfsg-3~bpo13+1","2026.05+dfsg-4","2026.05.1+dfsg-1","2026.05.1+dfsg-1~bpo13+1","2026.05.1+git20261001+dfsg-1","2026.05.1+git20261001+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-109399.json"}},{"package":{"name":"swupdate","ecosystem":"Debian:14","purl":"pkg:deb/debian/swupdate?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2026.05+dfsg-1"}]}],"versions":["2024.12.1+dfsg-3","2025.05+dfsg-1","2025.05+dfsg-2","2025.05+dfsg-2~bpo13+1","2025.05+dfsg-3","2025.05+dfsg-3~bpo13+1","2025.12+dfsg-1","2025.12+dfsg-10","2025.12+dfsg-10~bpo13+1","2025.12+dfsg-10~bpo13+2","2025.12+dfsg-2","2025.12+dfsg-2~bpo13+1","2025.12+dfsg-3","2025.12+dfsg-4","2025.12+dfsg-5","2025.12+dfsg-6","2025.12+dfsg-7","2025.12+dfsg-7~bpo13+1","2025.12+dfsg-8","2025.12+dfsg-9"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-109399.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}