CVE-2026-18103Medium· 4.9▾ SunlitA 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 sp…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 27 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Nov 6.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.7%
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.
dhcp (all versions)dhcp (all versions)dhcp (all versions)dhcp (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
To mitigate this issue, secure OMAPI access by configuring TSIG key authentication to prevent unauthorized connections to the OMAPI port (7911). If the dhcpd service has already crashed due to this flaw, manually remove the problematic InfiniBand lease entry from /var/lib/dhcpd/dhcpd.leases and then restart the dhcpd service. Restarting the dhcpd service may temporarily interrupt DHCP services for clients.
Connected by shared product, vendor, weakness, or advisory.
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