# CVE-2026-123270: CVE-2026-123270


- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 9 Nov 2026
- **Updated:** 9 Nov 2026
- **Also known as:** GHSA-h882-2qpw-598h

## What is CVE-2026-123270?

CVE-2026-123270 is a critical vulnerability in Redpanda Data Connect, published on 9 Nov 2026. 

### Official description

Redpanda Connect versions 4.39 to 4.110 contain a missing authentication vulnerability that enables unauthenticated remote code execution (RCE). In streams mode, the management HTTP API is exposed on `0.0.0.0:4195`, but authentication is disabled by default and there is no authentication gate protecting the stream CRUD routes. An unauthenticated attacker with network access to TCP/4195 can `POST` a malicious pipeline definition to `/streams/{id}` that includes code-executing processors such as `command`, `subprocess`, `ffi`, or unsafe `sql_raw`, thereby achieving arbitrary RCE on the host with the permissions of the Redpanda Connect service account. Because pipelines can also return command output in-band via HTTP, this vulnerability enables full host compromise, credential theft, and data exfiltration with no user interaction or credentials required.  

Starting with v4.111, the API endpoint was reconfigured as opt-in, so this and later versions are no longer vulnerable by default. However, RCE remains achievable on v4.111 and later if the management API is manually enabled via the `--bind-http` flag.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-123270?


## How do I fix CVE-2026-123270?

No fix has been published for CVE-2026-123270 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-123270 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-123270 exists.

Public exploit code:

- Redpanda Connect Streams API - Unauthenticated Remote Code Execution (nuclei): http/cves/2026/CVE-2026-123270.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123270 and fix it if it is affected.

What it is: CVE-2026-123270 is a critical vulnerability in Redpanda Data Connect, published on 9 Nov 2026. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-123270 exists.

Affected product: Redpanda Data Connect. 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-2026-123270/ (Markdown: https://insights.sbomify.com/CVE-2026-123270/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123270
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123270
- OSV: https://osv.dev/vulnerability/CVE-2026-123270

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-123270/
Summaries are generated and may contain mistakes; the official description above is the record.