CVE-2026-3608

NVDCVSS scored by security-officer@isc.org

Vulnerability Summary

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.

Severity Level

HIGH(7.5)

Published Date

Mar 25, 2026

Last Modified

Jun 30, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

1.36%Probability

Root Weakness (CWE)

CWE-617 ↗

See the MITRE CWE entry for the full definition of this weakness.

CVSS v3.1 Base Metrics — Score 7.5 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Not provided by NVD for this CVE.

Patched Versions

No patched version published yet

Until a fix ships, reduce exposure:

Restrict access to the affected service or interface to trusted networks.
Disable the affected feature if you do not need it.
Watch the vendor advisory for a firmware or software update.

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

Check whether you run the affected product and which version.
No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
Subscribe to the vendor advisory so you learn when a fix ships.

Timeline

Mar 25, 2026Published
Jun 30, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

External References

Referencehttps://downloads.isc.org/isc/kea/2.6.5
Referencehttps://downloads.isc.org/isc/kea/3.0.3
Referencehttps://kb.isc.org/docs/cve-2026-3608
Advisoryhttp://www.openwall.com/lists/oss-security/2026/03/25/6
Referencehttps://access.redhat.com/errata/RHSA-2026:11344
Referencehttps://access.redhat.com/errata/RHSA-2026:7342
Vendor Advisoryhttps://access.redhat.com/security/cve/CVE-2026-3608
Issue Trackinghttps://bugzilla.redhat.com/show_bug.cgi?id=2451139
Referencehttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3608.json

Data last checked: Nov 14, 2026 18:19 UTC