# CVE-2026-33606: Command injection in OX Dovecot CE

> Attackers can inject dsync protocol commands via crafted mail content, modifying mailbox state or causing errors during migration or replication.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 28 Aug 2026
- **Updated:** 28 Aug 2026
- **Also known as:** ALPINE-CVE-2026-33606, AZL-98304, DEBIAN-CVE-2026-33606, GHSA-wf8m-g4w9-3rc5, UBUNTU-CVE-2026-33606

## What is CVE-2026-33606?

CVE-2026-33606 is a medium-severity command injection vulnerability in Open-Xchange GmbH OX Dovecot CE, published on 28 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protocol, for example during a migration. Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. Avoid running dsync with the stream protocol on mailboxes with untrusted content. Update to non-vulnerable version. No publicly available exploits are known.

Weakness: CWE-93 (Improper Neutralization of CRLF Sequences)

## Which versions are affected by CVE-2026-33606?


## How do I fix CVE-2026-33606?

Upgrade to a fixed version.

## Is CVE-2026-33606 being exploited?

There is no known exploitation of CVE-2026-33606 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33606 and fix it if it is affected.

What it is: CVE-2026-33606 is a medium-severity command injection vulnerability in Open-Xchange GmbH OX Dovecot CE, published on 28 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-33606 in the wild and no public exploit code.

Affected product: Open-Xchange GmbH OX Dovecot CE. 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-2026-33606/ (Markdown: https://insights.sbomify.com/CVE-2026-33606/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33606
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33606
- OSV: https://osv.dev/vulnerability/CVE-2026-33606

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-33606/
Summaries are generated and may contain mistakes; the official description above is the record.