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Vulnerabilities CVE-2026-18103

CVE-2026-18103

Medium
Open
TLP:CLEAR

Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi

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Description

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.

Details

CVSS Score
4.9
EPSS Score
0.40%

33.3th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Aug 4, 2026
Last Modified
Aug 5, 2026
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