Stack overflow in Kea daemons
Summary
| CVE | CVE-2026-3608 |
|---|---|
| State | PUBLISHED |
| Assigner | isc |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-25 09:16:25 UTC |
| Updated | 2026-07-15 02:21:01 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.013610000 probability, percentile 0.686510000 (date 2026-07-18)
Problem Types: CWE-617 | CWE-617 CWE-617 Reachable Assertion | CWE-617 Reachable Assertion
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | CVSS | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | [email protected] | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | Secondary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | ISC | Kea | affected 2.6.0 2.6.4 custom | Not specified |
| CNA | ISC | Kea | affected 3.0.0 3.0.2 custom | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10 | unaffected 0:3.0.1-3.el10_1 * rpm | Not specified |
| ADP | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | unaffected 0:2.6.3-2.el10_0.3 * rpm | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| access.redhat.com/errata/RHSA-2026:7342 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3608.json | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | security.access.redhat.com | |
| bugzilla.redhat.com/show_bug.cgi | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | bugzilla.redhat.com | |
| access.redhat.com/errata/RHSA-2026:11344 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| downloads.isc.org/isc/kea/2.6.5 | [email protected] | downloads.isc.org | |
| kb.isc.org/docs/cve-2026-3608 | [email protected] | kb.isc.org | |
| access.redhat.com/security/cve/CVE-2026-3608 | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c | access.redhat.com | |
| www.openwall.com/lists/oss-security/2026/03/25/6 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| downloads.isc.org/isc/kea/3.0.3 | [email protected] | downloads.isc.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: ISC would like to thank Ali Norouzi of Keysight for bringing this vulnerability to our attention. (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2026-03-25T09:01:15.192Z | Reported to Red Hat. |
| ADP | 2026-03-25T08:46:48.992Z | Made public. |
Solutions
CNA: Upgrade to the patched release most closely related to your current version of Kea: 2.6.5 or 3.0.3.
ADP: RHSA-2026:11344: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
ADP: RHSA-2026:7342: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)
Workarounds
CNA: 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
Exploits
CNA: We are not aware of any active exploits.