CVE-2026-3608

Stack overflow in Kea daemons

Published Mar 25, 2026 CVSS 3.1 · 7.5 High EPSS 1.4% KEV · Not listed
Description
Sending a maliciously crafted message to the kea-ctrl-agent, kea-dhcp-ddns, kea-dhcp4, or kea-dhcp6 daemons over any configured API socket or HA listener can cause the receiving daemon to exit with a stack overflow error.
This issue affects Kea versions 2.6.0 through 2.6.4 and 3.0.0 through 3.0.2.

Remediation

Vendor Solution

Upgrade to the patched release most closely related to your current version of Kea: 2.6.5 or 3.0.3.


Vendor Workaround

Securing the API sockets with TLS, and requiring the client to authenticate with a certificate (mutual authentication), prevents the attacker from establishing an API connection to Kea. Set cert-required to true (the default) to require a client certificate. See: https://kea.readthedocs.io/en/stable/arm/security.html#tls-https-configuration

Tracking

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Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8403-1 Kea DHCP vulnerability
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Sending a maliciously crafted message to the kea-ctrl-agent, kea-dhcp-ddns, kea-dhcp4, or kea-dhcp6 daemons over any configured API socket or HA listener can cause the receiving daemon to exit with a stack overflow error. This issue affects Kea versions 2.6.0 through 2.6.4 and 3.0.0 through 3.0.2.
Title Stack overflow in Kea daemons
First Time appeared Isc
Isc kea
Weaknesses CWE-617
CPEs cpe:2.3:a:isc:kea:*:*:*:*:*:*:*:*
Vendors & Products Isc
Isc kea
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
isc
Published
Updated
Jul 15, 2026, 1:02 AM
Reserved
Mar 5, 2026, 5:47 PM
Status
Awaiting Analysis
Published
Mar 25, 2026, 9:16 AM
Modified
Jul 15, 2026, 2:21 AM
Severity
Important
Public date
Mar 25, 2026, 8:46 AM