# CVE-2026-33609: LDAP DN injection

> Attackers can read internal domain subtree data via LDAP DN injection when 8bit-dns is enabled in PowerDNS Authoritative.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Apr 2026
- **Updated:** 22 Apr 2026
- **Also known as:** DEBIAN-CVE-2026-33609, GHSA-q8p8-x4x3-fvqm, UBUNTU-CVE-2026-33609

## What is CVE-2026-33609?

CVE-2026-33609 is a medium-severity vulnerability in PowerDNS Authoritative, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Incomplete escaping of LDAP queries when running with 8bit-dns enabled allows users to perform queries of internal domain subtrees.

Weakness: CWE-90 (Improper Neutralization of Special Elements used in an LDAP Query)

## Which versions are affected by CVE-2026-33609?

It affects 1 product.


Products: Powerdns Authoritative.

## How do I fix CVE-2026-33609?

Apply the vendor's patch.

## Is CVE-2026-33609 being exploited?

There is no known exploitation of CVE-2026-33609 in the wild and no public exploit code.

## Other vulnerabilities in PowerDNS Authoritative

- [CVE-2020-24698](https://insights.sbomify.com/CVE-2020-24698/): Use after free in n/a (critical 9.8)
- [CVE-2020-24696](https://insights.sbomify.com/CVE-2020-24696/): Race condition in n/a (high 8.1)
- [CVE-2015-5470](https://insights.sbomify.com/CVE-2015-5470/): Denial of service in n/a (high 7.8)
- [CVE-2026-42001](https://insights.sbomify.com/CVE-2026-42001/): Insufficient Validation of Autoprimary SOA Queries (high 7.5)
- [CVE-2020-24697](https://insights.sbomify.com/CVE-2020-24697/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33609 and fix it if it is affected.

What it is: CVE-2026-33609 is a medium-severity vulnerability in PowerDNS Authoritative, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-33609 in the wild and no public exploit code.

Affected product: PowerDNS Authoritative. 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-2026-33609/ (Markdown: https://insights.sbomify.com/CVE-2026-33609/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33609
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33609
- OSV: https://osv.dev/vulnerability/CVE-2026-33609

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33609/
Summaries are generated and may contain mistakes; the official description above is the record.