# GHSA-9gp7-6833-wv89: etcd having a negative value for cluster node size results in an index out-of-bound panic during service discovery

> An attacker can cause a denial of service in etcd by providing a negative cluster size during service discovery, leading to a panic.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Oct 2022

## What is GHSA-9gp7-6833-wv89?

GHSA-9gp7-6833-wv89 is a denial of service vulnerability in go.etcd.io/etcd/client/v3, published on 6 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

### Vulnerability type
Data Validation

### Detail
When an etcd instance attempts to perform service discovery, if a cluster size is provided as a negative value, the etcd instance will panic without recovery.

### References
Find out more on this vulnerability in the [security audit report](https://github.com/etcd-io/etcd/blob/master/security/SECURITY_AUDIT.pdf)

### For more information
If you have any questions or comments about this advisory:
* Contact the [etcd security committee](https://github.com/etcd-io/etcd/blob/master/security/security-release-process.md#product-security-committee-psc)

## Which versions are affected by GHSA-9gp7-6833-wv89?

4 open source packages ship an affected version, including go.etcd.io/etcd/client/v3.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `go.etcd.io/etcd/client/v3` | Go | All versions | 3.3.23 |
| `go.etcd.io/etcd/client/v3` | Go | All versions | 3.3.23 |
| `go.etcd.io/etcd/client/v3` | Go | From 3.4.0 | 3.4.10 |
| `go.etcd.io/etcd/client/v3` | Go | From 3.4.0 | 3.4.10 |

## How do I fix GHSA-9gp7-6833-wv89?

Upgrade go.etcd.io/etcd/client/v3 to a fixed version for your release line: 3.3.23 or 3.4.10.

## Is GHSA-9gp7-6833-wv89 being exploited?

There is no known exploitation of GHSA-9gp7-6833-wv89 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-9gp7-6833-wv89 and fix it if it is affected.

What it is: GHSA-9gp7-6833-wv89 is a denial of service vulnerability in go.etcd.io/etcd/client/v3, published on 6 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of GHSA-9gp7-6833-wv89 in the wild and no public exploit code.

Affected packages and fixed versions:
- go.etcd.io/etcd/client/v3 (Go): affected all versions; fixed in 3.3.23
- go.etcd.io/etcd/client/v3 (Go): affected all versions; fixed in 3.3.23
- go.etcd.io/etcd/client/v3 (Go): affected from 3.4.0; fixed in 3.4.10
- go.etcd.io/etcd/client/v3 (Go): affected from 3.4.0; fixed in 3.4.10

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/GHSA-9gp7-6833-wv89/ (Markdown: https://insights.sbomify.com/GHSA-9gp7-6833-wv89/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-9gp7-6833-wv89

---
From sbomify Insights: https://insights.sbomify.com/GHSA-9gp7-6833-wv89/
Summaries are generated and may contain mistakes; the official description above is the record.