DEBIAN-CVE-2026-18103

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Source

https://security-tracker.debian.org/tracker/CVE-2026-18103

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-18103.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-18103

Upstream

CVE-2026-18103

Published

2026-08-05T00:16:59Z

Modified

2026-09-14T17:00:50Z

Severity

4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

[none]

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.

References

https://security-tracker.debian.org/tracker/CVE-2026-18103

Affected packages

Debian:12 / isc-dhcp

Package

Name: isc-dhcp
Purl: pkg:deb/debian/isc-dhcp?arch=source&distro=bookworm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.3-P1-2

4.4.3-P1-3

4.4.3-P1-4

4.4.3-P1-5~exp1

4.4.3-P1-5~exp2

4.4.3-P1-5

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"

Debian:13 / isc-dhcp