Rancher: Server-Side Request Forgery
CVE-2026-44937 is a high-severity server-side request forgery vulnerability in Rancher from SUSE, with a CVSS 3.1 base score of 8.2 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 0.15.2, 0.14.6, 0.13.11 as the first without the flaw, so updating Rancher to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.42% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Rancher to 0.15.2 or 0.14.6 or 0.13.11 or 0.12.15, whichever matches your release line, or a later version.
- Update Rancher Fleet to 0.12.15 or 0.13.11 or 0.14.6 or 0.15.2, whichever matches your release line, or a later version.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| SUSE | Rancher | 0.15.0 up to, but not including, 0.15.2; 0.14.0 up to, but not including, 0.14.6; 0.13.0 up to, but not including, 0.13.11; 0.12.0 up to, but not including, 0.12.15 | 0.15.2, 0.14.6, 0.13.11, 0.12.15 |
| SUSE | Rancher Fleet | 0.12.0 up to, but not including, 0.12.15; 0.13.0 up to, but not including, 0.13.11; 0.14.0 up to, but not including, 0.14.6; 0.15.0 up to, but not including, 0.15.2 | 0.12.15, 0.13.11, 0.14.6, 0.15.2 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- LowLimited modification of data is possible.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 8.3 | High | CNA (suse.de) |
| CVSS 3.1 | 8.2 | High | NVD |
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.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Server-Side Request Forgery
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.
How developers prevent this class of flaw
- If there is a known list of applications, IP, hostname, and/or domains to which the product is allowed to communicate, then use allowlists to ensure that outgoing requests are restricted to these known entities. The allowlists could be in the application code or possibly enforced by firewalls or network segmentation.
- If the product is expected to be able to connect to arbitrary IP addresses or domains, consider using a denylist that includes private network addresses, internal domain names, etc. The denylist could be in the application code or possibly enforced by firewalls or network segmentation.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in Rancher
- 9.1 Critical severity
- 7.2 High severity
- 9.1 Critical severity
- 7.6 High severity
- 7.9 High severity
- 8.5 High severity
Recent Server-Side Request Forgery vulnerabilities
- 8.6 High severity
- 9.1 Critical severity
- 8.5 High severity
- 8.8 High severity
- 7.7 High severity
- 9.9 Critical severity
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