# CVE-2026-33611: Insufficient validation of HTTPS and SVCB records

> An authenticated operator can corrupt the LMDB database via invalid HTTPS/SVCB records, causing denial of service in PowerDNS Authoritative.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **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-2026-33611, GHSA-vqqc-7rwf-3j3j, UBUNTU-CVE-2026-33611

## What is CVE-2026-33611?

CVE-2026-33611 is a medium-severity vulnerability in PowerDNS Authoritative, published on 22 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

An operator allowed to use the REST API can cause the Authoritative server to produce invalid HTTPS or SVCB record data, which can in turn cause LMDB database corruption, if using the LMDB backend.

Weakness: CWE-190 (Integer Overflow or Wraparound)

## Which versions are affected by CVE-2026-33611?

It affects 1 product.


Products: Powerdns Authoritative.

## How do I fix CVE-2026-33611?

Apply the vendor's patch.

## Is CVE-2026-33611 being exploited?

There is no known exploitation of CVE-2026-33611 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-2026-33611 and fix it if it is affected.

What it is: CVE-2026-33611 is a medium-severity vulnerability in PowerDNS Authoritative, published on 22 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-33611 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-2026-33611/ (Markdown: https://insights.sbomify.com/CVE-2026-33611/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33611
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33611
- OSV: https://osv.dev/vulnerability/CVE-2026-33611

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33611/
Summaries are generated and may contain mistakes; the official description above is the record.