4.3

CVE-2026-75036

Fleet: DNS exfiltration via Sprig getHostByName in fleet.yaml Helm template preprocessing

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Suse ≫ Rancher Fleet Version >= 0.12.0 < 0.12.19
Suse ≫ Rancher Fleet Version >= 0.13.0 < 0.13.15
Suse ≫ Rancher Fleet Version >= 0.14.0 < 0.14.10
Suse ≫ Rancher Fleet Version >= 0.15.0 < 0.15.6
Suse ≫ Rancher Fleet Version >= 0.16.0 < 0.16.1
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.22% 0.118
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 4.3 2.8 1.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SUSE 5.3 0 0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine

The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine.

CWE-918 Server-Side Request Forgery (SSRF)

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.

https://github.com/rancher/fleet/security/advisories/GHSA-x9m6-xcjr-hpjp
Vendor Advisory