CVE-2026-3608: Stack overflow in Kea daemons

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-25 · updated 2026-07-15
Weakness: CWE-617

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.

Affected products

ISC Kea: from 2.6.0 through 2.6.4; from 3.0.0 through 3.0.2

References

https://downloads.isc.org/isc/kea/2.6.5
https://downloads.isc.org/isc/kea/3.0.3
https://kb.isc.org/docs/cve-2026-3608
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

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