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CVE-2026-18103

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

Published: Aug 4, 2026Updated: Aug 6, 2026 Sources: CVE List NVDCWE-120
4.9MEDIUM
NVD MITRE
EPSS Score
0.4%
Top 67.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-120

Affected Products

Red Hat
commercial·US
Red Hat Enterprise Linux 6On-premOS
Operating Systems / linux-distro
and 3 more affected products View all →

Exploitability

Workaround Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://access.redhat.com/security/cve/CVE-2026-18103
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2508081
bugzilla.redhat.com

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