CVE-2026-44939 Command injection through unsanitized YAML parameter in Rancher
Remote attackers can execute malicious containers via command injection in the Rancher cluster import endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-44939?
CVE-2026-44939 is a critical command injection vulnerability in SUSE Rancher, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A command injection vulnerability in the Rancher Manager cluster before 2.14.2 import endpoint /v3/import/{token}_{clusterId}.yaml through unsanitized YAML parameters could allow remote attackers to break out of an image, and execute e.g. malicious containers.
Weakness: CWE-95
Which versions are affected by CVE-2026-44939?
13 open source packages ship an affected version, including github.com/rancher/rancher.
| Package | Affected | Fixed in |
|---|---|---|
github.com/rancher/rancher Go | All versions | 0.0.0-20260617231817-2aa77eb283e7 |
github.com/rancher/rancher Go | All versions | 0.0.0-20260617231817-2aa77eb283e7 |
github.com/rancher/rancher Go | All versions | 0.0.0-20260617231817-2aa77eb283e7 |
github.com/rancher/rancher Go | From 2.10.0 | 2.10.12 |
github.com/rancher/rancher Go | From 2.10.0 | 2.10.12 |
github.com/rancher/rancher Go | From 2.11.0 | 2.11.14 |
7 more packages
github.com/rancher/rancher Go | From 2.11.0 | 2.11.14 |
github.com/rancher/rancher Go | From 2.12.0 | 2.12.10 |
github.com/rancher/rancher Go | From 2.12.0 | 2.12.10 |
github.com/rancher/rancher Go | From 2.13.0 | 2.13.6 |
github.com/rancher/rancher Go | From 2.13.0 | 2.13.6 |
github.com/rancher/rancher Go | From 2.14.0 | 2.14.2 |
github.com/rancher/rancher Go | From 2.14.0 | 2.14.2 |
How do I fix CVE-2026-44939?
Upgrade github.com/rancher/rancher to a fixed version for your release line: 0.0.0-20260617231817-2aa77eb283e7, 2.10.12, 2.11.14 or 2.12.10.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-44939 being exploited?
There is no known exploitation of CVE-2026-44939 in the wild and no public exploit code.
Sources
Also known as GHSA-mhc6-2gfq-xx62, GO-2026-5875.