# CVE-2026-24027: Crafted zones can lead to increased incoming network traffic

> Attackers can craft malicious DNS zones to cause excessive incoming network traffic, potentially leading to service disruption for PowerDNS Recursor users.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 9 Feb 2026
- **Updated:** 9 Feb 2026
- **Also known as:** DEBIAN-CVE-2026-24027, GHSA-m7h2-p2wj-5964, UBUNTU-CVE-2026-24027

## What is CVE-2026-24027?

CVE-2026-24027 is a medium-severity denial of service vulnerability in Powerdns Recursor, published on 9 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Crafted zones can lead to increased incoming network traffic.

Weakness: CWE-294 (Authentication Bypass by Capture-replay)

## Which versions are affected by CVE-2026-24027?

It affects 1 product.


Products: Powerdns Recursor.

## How do I fix CVE-2026-24027?

Upgrade to a fixed version.

## Is CVE-2026-24027 being exploited?

There is no known exploitation of CVE-2026-24027 in the wild and no public exploit code.

## Other vulnerabilities in Powerdns Recursor

- [CVE-2009-4009](https://insights.sbomify.com/CVE-2009-4009/): Memory corruption in n/a (critical 10.0)
- [CVE-2020-10030](https://insights.sbomify.com/CVE-2020-10030/): Memory corruption in n/a (high 8.8)
- [CVE-2025-59023](https://insights.sbomify.com/CVE-2025-59023/): Crafted delegations or IP fragments can poison cached delegations in Recursor (high 8.2)
- [CVE-2025-59030](https://insights.sbomify.com/CVE-2025-59030/): Insufficient validation of incoming notifies over TCP can lead to a denial of service in Recursor (high 7.5)
- [CVE-2023-22617](https://insights.sbomify.com/CVE-2023-22617/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-24027 and fix it if it is affected.

What it is: CVE-2026-24027 is a medium-severity denial of service vulnerability in Powerdns Recursor, published on 9 Feb 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-2026-24027 in the wild and no public exploit code.

Affected product: Powerdns Recursor. 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-2026-24027/ (Markdown: https://insights.sbomify.com/CVE-2026-24027/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-24027
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-24027
- OSV: https://osv.dev/vulnerability/CVE-2026-24027

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-24027/
Summaries are generated and may contain mistakes; the official description above is the record.