# CVE-2026-3608: Stack overflow in Kea daemons > Attackers can crash Kea DHCP daemons by sending malicious messages to API sockets or HA listeners, causing a stack overflow and service disruption. - **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 25 Mar 2026 - **Updated:** 15 Jul 2026 - **Also known as:** ALPINE-CVE-2026-3608, ALSA-2026:7342, DEBIAN-CVE-2026-3608, GHSA-8xcr-6f99-hm7w, RHSA-2026:11344, RHSA-2026:7342, RLSA-2026:7342, SUSE-SU-2026:1378-1, SUSE-SU-2026:1548-1, UBUNTU-CVE-2026-3608, openSUSE-SU-2026:10421-1 ## What is CVE-2026-3608? CVE-2026-3608 is a high-severity denial of service vulnerability in ISC Kea, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official 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. Weakness: CWE-617 (Reachable Assertion) ## Which versions are affected by CVE-2026-3608? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `kea-doc` | AlmaLinux:10 | All versions | 3.0.1-3.el10_1 | | `kea` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-debuginfo` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-debugsource` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-devel-debuginfo` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-doc` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-hooks` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-hooks-debuginfo` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-keama` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-keama-debuginfo` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-libs` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea-libs-debuginfo` | Red Hat:enterprise_linux:10.1 | All versions | 0:3.0.1-3.el10_1 | | `kea` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-debuginfo` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-debugsource` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-doc` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-hooks` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-hooks-debuginfo` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-keama` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-keama-debuginfo` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-libs` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea-libs-debuginfo` | Red Hat:enterprise_linux_eus:10.0 | All versions | 0:2.6.3-2.el10_0.3 | | `kea` | Rocky Linux:10 | All versions | 0:3.0.1-3.el10_1 | | `kea` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 2.6.5-150700.3.6.1 | | `kea` | SUSE:Linux Enterprise Module for Server Applications 15 SP7 | All versions | 2.6.5-150700.3.6.1 | | `kea` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 2.6.5-150600.13.9.1 | | `kea` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 2.6.5-150600.13.9.1 | | `kea` | openSUSE:Tumbleweed | All versions | 3.0.3-1.1 | ## How do I fix CVE-2026-3608? Apply the vendor's patch. ## Is CVE-2026-3608 being exploited? There is no known exploitation of CVE-2026-3608 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-3608 and fix it if it is affected. What it is: CVE-2026-3608 is a high-severity denial of service vulnerability in ISC Kea, published on 25 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-3608 in the wild and no public exploit code. Affected product: ISC Kea. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-3608/ (Markdown: https://insights.sbomify.com/CVE-2026-3608/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3608 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3608 - OSV: https://osv.dev/vulnerability/CVE-2026-3608 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-3608/ Summaries are generated and may contain mistakes; the official description above is the record.