Rancher Fleet SSRF in Bundle Reader via Unvalidated Helm Repository URL in fleet.yaml

published 2026-07-01 4 mo ago modified 2026-10-25 14 d ago also GHSA-hx4v-cxpf-vh8m , GO-2026-5873 , EUVD-2026-41863

cvss: 5.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits: 0; none known

Missing filtering when the helmRepoURLRegex field isn't set on a GitRepo resource in SUSE Rancher Fleet's bundle reader in 0.15 before 0.15.2, 0.14 before 0.14.6, 0.13 before 0.13.11 and 0.12 before 0.12.15 forwards Helm authentication credentials (BasicAuth) to any URL specified in the helm.repo field of a fleet.yaml file, allowing attackers able to push to fleet monitored git repos to leak helm access credentials.

Patch / fix

fixed in 2 distros 1

go github.com/rancher/fleet 0.12.15, 0.13.11, 0.14.6, 0.15.2
SUSE Rancher 0.12.15, 0.13.11, 0.14.6, 0.15.2

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 4 mo ago (2026-07-06)

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/advisories/GHSA-hx4v-cxpf-vh8m referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
NVD	3.1	5.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
GitHub	3.1	5.0	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/rancher/fleet	>=0.15.0, <0.15.2 >=0.14.0, <0.14.6 >=0.13.0, <0.13.11 >=0.12.0, <0.12.15	0.15.2 0.14.6 0.13.11 0.12.15

Affected products

SUSE Rancher

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

github.com /advisories/GHSA-hx4v-cxpf-vh8m
vendor-advisory, exploit, third-party-advisory, mitigation
github.com /rancher/fleet/security/advisories/GHSA-hx4v-cxpf-vh8m
web, advisory
github.com /rancher/fleet
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary