CVE-2026-44936 Rancher Fleet SSRF in Bundle Reader via Unvalidated Helm Repository URL in fleet.yaml
Attackers with Git push access can leak Helm credentials by specifying arbitrary URLs in fleet.yaml due to missing validation in Rancher Fleet.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44936?
CVE-2026-44936 is a medium-severity server-side request forgery vulnerability in SUSE Rancher, published on 6 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Missing filtering when the helmRepoURLRegex field isn't set on a GitRepo resource in SUSE Rancher Fleet's bundle reader in 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.15 forwards Helm authentication credentials (BasicAuth) to any URL specified in the helm.repo field of a fleet.yaml file, allowing attackers able to push to fleet monitored git repos to leak helm access credentials.
Weakness: CWE-918
Which versions are affected by CVE-2026-44936?
9 open source packages ship an affected version, including github.com/rancher/fleet. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/rancher/fleet Go | From 0.12.0 | 0.12.15, 0.13.11, 0.14.6, 0.15.2 |
github.com/rancher/fleet Go | From 0.12.0 | 0.12.15 |
github.com/rancher/fleet Go | From 0.12.0 | 0.12.15 |
github.com/rancher/fleet Go | From 0.13.0 | 0.13.11 |
github.com/rancher/fleet Go | From 0.13.0 | 0.13.11 |
github.com/rancher/fleet Go | From 0.14.0 | 0.14.6 |
3 more packages
github.com/rancher/fleet Go | From 0.14.0 | 0.14.6 |
github.com/rancher/fleet Go | From 0.15.0 | 0.15.2 |
github.com/rancher/fleet Go | From 0.15.0 | 0.15.2 |
Products include Suse Rancher Fleet.
How do I fix CVE-2026-44936?
Upgrade github.com/rancher/fleet to a fixed version for your release line: 0.12.15, 0.13.11, 0.14.6 or 0.15.2.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-44936 being exploited?
There is no known exploitation of CVE-2026-44936 in the wild and no public exploit code.
Other vulnerabilities in SUSE Rancher
- CVE-2026-44935 Rancher Fleet vulnerable to cross namespace secret disclosure via unvalidated `valuesFrom` references in Helm Deployer
- CVE-2026-41050 Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering
- CVE-2026-88808 Privilege escalation in Rancher
- CVE-2026-44938 Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent
- CVE-2026-44937 SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components
Sources
Also known as GHSA-hx4v-cxpf-vh8m, GO-2026-5873.