High 7.5Published Mar 25, 2026

CVE-2026-3608Stack overflow in Kea daemons

Updated under an hour ago (Oct 26, 2026, 1:20 AM ET)

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It affects ISC Kea and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for ISC Kea

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-617
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: isc
NVD analysis: Awaiting Analysis
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ISC Kea isc:kea (from the name)	from 2.6.0 through 2.6.4; from 3.0.0 through 3.0.2	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:3.0.1-3.el10_1 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:2.6.3-2.el10_0.3 not affected	CISA ADP

References

https://kb.isc.org/docs/cve-2026-3608vendor-advisory
https://downloads.isc.org/isc/kea/2.6.5patch
https://downloads.isc.org/isc/kea/3.0.3patch
http://www.openwall.com/lists/oss-security/2026/03/25/6
https://access.redhat.com/errata/RHSA-2026:11344
https://access.redhat.com/errata/RHSA-2026:7342
https://access.redhat.com/security/cve/CVE-2026-3608
https://bugzilla.redhat.com/show_bug.cgi?id=2451139
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3608.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.