# CVE-2026-71194: Denial of service in Designate

> An unauthenticated attacker can cause a denial of service in OpenStack Designate by sending a single UDP packet that triggers a deterministic lookup failure.

- **Severity:** Medium 6.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Aug 2026
- **Updated:** 13 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-71194, GHSA-r7xh-5qq7-jh72, UBUNTU-CVE-2026-71194

## What is CVE-2026-71194?

CVE-2026-71194 is a medium-severity denial of service vulnerability in OpenStack Designate, published on 12 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In OpenStack Designate before 22.0.2, the mDNS handler performs pool-blind lookups when resolving record queries and NOTIFY requests. When two zones with the same name exist across different pools, the lookup fails with a deterministic error, causing the handler to return REFUSED for all DNS queries through that path. The _handle_notify path is exploitable via a single unauthenticated UDP packet. This is independently reachable through the cross-tenant zone overlap described in a different recent CVE, and also affects legitimate same-tenant cross-pool configurations. BIND9 views do not mitigate this issue as mDNS is a shared service upstream of any view configuration.

Weakness: CWE-669 (Incorrect Resource Transfer Between Spheres)

## Which versions are affected by CVE-2026-71194?


## How do I fix CVE-2026-71194?

Upgrade to a fixed version.

## Is CVE-2026-71194 being exploited?

There is no known exploitation of CVE-2026-71194 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-71194 and fix it if it is affected.

What it is: CVE-2026-71194 is a medium-severity denial of service vulnerability in OpenStack Designate, published on 12 Aug 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-2026-71194 in the wild and no public exploit code.

Affected product: OpenStack Designate. 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-2026-71194/ (Markdown: https://insights.sbomify.com/CVE-2026-71194/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-71194
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-71194
- OSV: https://osv.dev/vulnerability/CVE-2026-71194

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-71194/
Summaries are generated and may contain mistakes; the official description above is the record.