SUSE Rancher Fleet <=0.15.1 Webhook request forgery leading to DoS
CVE-2026-44937 Published on July 6, 2026
SUSE Rancher Fleet had an Unauthenticated Webhook: Regex Injection via Unsanitized Repository URL Components
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 Type
What is a SSRF Vulnerability?
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-44937 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-44937
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Affected Versions
SUSE Rancher:- Version 0.15.0 and below 0.15.2 is affected.
- Version 0.14.0 and below 0.14.6 is affected.
- Version 0.13.0 and below 0.13.11 is affected.
- Version 0.12.0 and below 0.12.15 is affected.