CVE-2026-18103
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.
- Score
- CVSS 3.1 4.9 Medium
- Status
- Awaiting Analysis - secalert@redhat.com
- Published
- 2026-08-04
- Last modified
- 2026-08-05
- Weaknesses
- CWE-120
Affected products
References
- https://access.redhat.com/security/cve/CVE-2026-18103
- https://bugzilla.redhat.com/show_bug.cgi?id=2508081
