---
title: "CVE-2026-42005\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-2026-42005?format=md
keywords: index, follow
---

# CVE-2026-42005

Publication date 25 June 2026

Last updated 29 June 2026

---

Ubuntu priority

**Medium**

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

## Cvss 3 Severity Score

**4.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-42005?format=md#impact-score)

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## Description

An attacker can send a web request that causes unlimited memory
allocation in the internal web server, leading to a denial of service.
The internal web server is disabled by default.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| dnsdist | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| pdns | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| pdns-recursor | 26.04 LTS resolute | Not affected |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 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)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

4.3 · Medium

* Base metrics

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

  | Parameter | Value |
  | --- | --- |
  | Base score | 4.3 · Medium |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-42005)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-42005)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-42005)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-42005)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-42005>
* <https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-08.html#cve-2026-42005-unbounded-resource-consumption-in-internal-webserver>
* <https://doc.powerdns.com/authoritative/security-advisories/powerdns-advisory-2026-07.html>
* <https://github.com/PowerDNS/pdns/commit/11e4f2da8259e5070e7a193f48d23ade38b71dc0>
* <https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html#cve-2026-42005-insufficient-input-validation-of-internal-web-server>