---
title: "CVE-2026-3608\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-3608?format=md
keywords: index, follow
---

# CVE-2026-3608

Publication date 25 March 2026

Last updated 8 June 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-3608?format=md#impact-score)

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## 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.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| isc-kea | 26.04 LTS resolute | Not affected |
| 25.10 questing | Fixed 2.6.3-2ubuntu0.1 |
| 24.04 LTS noble | Fixed 2.4.1-3ubuntu0.2 |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2026-3608?format=md#patch-details)

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| isc-kea | * Upstream:   [5dc0f66](https://github.com/isc-projects/kea/commit/5dc0f6612aa5f6003eb7b8e5299f7774f46e5849) * Upstream:   [6ef0208](https://github.com/isc-projects/kea/commit/6ef02087bdf0f5158ad0654d9bdc30c166241e19) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | None |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-3608)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-3608)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-3608)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-3608)

### Related Ubuntu Security Notices (USN)

+ [USN-8403-1](https://usn.ubuntu.com/USN-8403-1)
+ Kea DHCP vulnerability
+ 8 June 2026

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-3608>