# CVE-2026-85220: Denial-of-Service in the Thinkst Canary Redis service

> Unauthenticated remote attackers can cause a denial of service in the Thinkst Canary honeypot if the Redis service is enabled.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/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:** No
- **Published:** 21 Sep 2026
- **Updated:** 21 Sep 2026
- **Also known as:** GHSA-x7vx-qh4q-fg6x

## What is CVE-2026-85220?

CVE-2026-85220 is a low-severity denial of service vulnerability in Thinkst Applied Research Canary, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the Thinkst Canary honeypot Redis service allows an unauthenticated remote attacker to execute a Denial-of-Service attack against the honeypot.

The vulnerability is accessible when the Redis service is enabled only.

The Canary is NOT affected if the Redis service is disabled.

Thinkst has addressed this issue on all supported platforms.

New update files to address this issue are available on all platforms except Docker. For Docker customers, a new Docker image has been published which includes the patch. Customers with automatic updates enabled already have updates in distribution. If automatic updates are disabled, customers are advised to update their Canaries.

Workarounds are available for customers unable to update at this time.

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2026-85220?


## How do I fix CVE-2026-85220?

No fix has been published for CVE-2026-85220 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-85220 being exploited?

There is no known exploitation of CVE-2026-85220 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-85220 and fix it if it is affected.

What it is: CVE-2026-85220 is a low-severity denial of service vulnerability in Thinkst Applied Research Canary, published on 21 Sep 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-2026-85220 in the wild and no public exploit code.

Affected product: Thinkst Applied Research Canary. 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-2026-85220/ (Markdown: https://insights.sbomify.com/CVE-2026-85220/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-85220
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-85220
- OSV: https://osv.dev/vulnerability/CVE-2026-85220

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-85220/
Summaries are generated and may contain mistakes; the official description above is the record.