CVE-2026-75036 Fleet: DNS exfiltration via Sprig getHostByName in fleet.yaml Helm template preprocessing
Attackers can exfiltrate cluster metadata and network information via DNS requests during Helm template preprocessing in Fleet.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75036?
CVE-2026-75036 is a medium-severity server-side request forgery vulnerability in SUSE Fleet, published on 3 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security vulnerability was discovered in Fleet's Helm template preprocessing where templates evaluated by the Fleet controller could reach network resources outside the management cluster. A user who can supply bundle content to a repository referenced by a `GitRepo` resource can cause the Fleet controller to: - Disclose cluster metadata available to the templating context. - Reveal information about hosts reachable from the controller's network position. Because the disclosure channel is name resolution, it may remain effective in environments where outbound traffic is otherwise restricted. The disclosed information is limited to values exposed to the Fleet templating context and to name resolution results. Integrity and availability of managed clusters are not affected.
This issue affects Fleet: from 0.12.0 before 0.12.19, from 0.13.0 before 0.13.15, from 0.14.0 before 0.14.10, from 0.15.0 before 0.15.6, and from 0.16.0 before 0.16.1.
Which versions are affected by CVE-2026-75036?
It affects 1 product.
Products include Suse Rancher Fleet.
How do I fix CVE-2026-75036?
No fix has been published for CVE-2026-75036 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-75036 being exploited?
There is no known exploitation of CVE-2026-75036 in the wild and no public exploit code.
Other vulnerabilities in SUSE Fleet
- 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-x9m6-xcjr-hpjp.