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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | Kea | 2.6.0 – ≤ 2.6.4, 3.0.0 – ≤ 3.0.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | isc-kea | 3.0.3-1 | — |
| Debian 13 | isc-kea | 2.6.3-1+deb13u1 | — |
| Debian 12 | isc-kea | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | isc-kea | 2.6.3-2ubuntu0.1 | — |
| Ubuntu 24.04 LTS | isc-kea | 2.4.1-3ubuntu0.2 | — |
| Ubuntu 22.04 LTS | isc-kea | No fix yet | — |
| Ubuntu 20.04 LTS | isc-kea | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | isc-kea | No fix yet | — |
| Ubuntu Pro 16.04 LTS | isc-kea | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | kea +4 | 3.0.1-3.el10_1 | RHSA-2026:7342 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | kea +4 | 2.6.3-2.el10_0.3 | RHSA-2026:11344 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | kea-doc | 3.0.1-3.el10_1 | ALSA-2026:7342 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | kea | 3.0.1-3.el10_1 | RLSA-2026:7342 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | kea | 2.6.5-150700.3.6.1 | SUSE-SU-2026:1378-1 |
| SLES 15 SP6 | kea | 2.6.5-150600.13.9.1 | SUSE-SU-2026:1548-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kea | 3.0.3-160000.1.1 | SUSE-SU-2026:20989-1 |
| SLES for SAP 15 SP6 | kea | 2.6.5-150600.13.9.1 | SUSE-SU-2026:1548-1 |
| SLES 16.0 | kea | 3.0.3-160000.1.1 | SUSE-SU-2026:20989-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kea | 3.0.3-1.1 | openSUSE-SU-2026:10421-1 |
| openSUSE Leap 16.0 | kea | 3.0.3-160000.1.1 | openSUSE-SU-2026:20452-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | kea | 3.0.3-r0 | — |
| Alpine v3.23 | kea | 3.0.3-r0 | — |
| Alpine v3.22 | kea | 2.6.5-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | kea +4 | 3.0.1-3.el10_1 | ELSA-2026-7342 |
Advisories 11
- ALSA-2026:7342 Important: kea security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:7342 Red Hat Security Advisory: kea security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2026:11344 Red Hat Security Advisory: kea security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- WID-SEC-2026-0887 Internet Systems Consortium Kea: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jun 8, 2026
- SUSE-SU-2026:1548-1 Security update for kea SUSE / openSUSE Security Updates · Apr 23, 2026
- SUSE-SU-2026:1378-1 Security update for kea SUSE / openSUSE Security Updates · Apr 17, 2026
- RLSA-2026:7342 Important: kea security update Rocky Linux Security Advisories · Apr 11, 2026
- SUSE-SU-2026:20989-1 Security update for kea SUSE / openSUSE Security Updates · Apr 10, 2026
- ELSA-2026-7342 Important: kea security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Apr 10, 2026
- openSUSE-SU-2026:20452-1 Security update for kea SUSE / openSUSE Security Updates · Apr 3, 2026
- openSUSE-SU-2026:10421-1 kea-3.0.3-1.1 on GA media SUSE / openSUSE Security Updates · Mar 26, 2026
References
- CVE-2026-3608 vendor-advisory
- https://downloads.isc.org/isc/kea/2.6.5 patch
- https://downloads.isc.org/isc/kea/3.0.3 patch