{"id":"DEBIAN-CVE-2026-18103","details":"A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention.","modified":"2026-09-14T17:00:50.355098553Z","published":"2026-08-05T00:16:59.110Z","upstream":["CVE-2026-18103"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-18103"}],"affected":[{"package":{"name":"isc-dhcp","ecosystem":"Debian:12","purl":"pkg:deb/debian/isc-dhcp?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.3-P1-2","4.4.3-P1-3","4.4.3-P1-4","4.4.3-P1-5","4.4.3-P1-5~exp1","4.4.3-P1-5~exp2","4.4.3-P1-6","4.4.3-P1-7","4.4.3-P1-8"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18103.json"}},{"package":{"name":"isc-dhcp","ecosystem":"Debian:13","purl":"pkg:deb/debian/isc-dhcp?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.3-P1-8"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18103.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"}]}