CVE-2026-44937 SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components

What is CVE-2026-44937?

CVE-2026-44937 is a high-severity server-side request forgery vulnerability in SUSE Rancher, published on 6 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Potential forgery of webhook requests when using a unauthenticated webhook in SUSE Rancher Fleet 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.5 could be used by remote attackers to cause a denial of service or a downgrade attack on other repositories on the system.

Weakness: CWE-918

Which versions are affected by CVE-2026-44937?

9 open source packages ship an affected version, including github.com/rancher/fleet. It affects 1 product.

Products include Suse Rancher Fleet.

How do I fix CVE-2026-44937?

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-2026-44937 being exploited?

There is no known exploitation of CVE-2026-44937 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 Critical 9.9
• CVE-2026-41050 Helm impersonation bypass of `RESTClientGetter` retains `cluster-admin` during template rendering Critical 9.9
• CVE-2026-88808 Privilege escalation in Rancher High 8.8
• CVE-2026-44938 Fleet has PSS Bypass through addLabelsFromOptions in Fleet Agent High 8.8
• CVE-2026-93538 Missing authorization in Rancher High 7.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jmf4-m7j9-g72r, GO-2026-5874.