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                            CERT-Renater

                Note d'Information No. 2026/VULN104
_____________________________________________________________________

DATE                : 02/02/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Rancher versions prior to 2.13.2,
                                2.12.6, 2.11.10, 2.10.11.

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https://github.com/rancher/rancher/security/advisories/GHSA-mc24-7m59-4q5p
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Rancher CLI skips TLS verification on Rancher CLI login command
High
samjustus published GHSA-mc24-7m59-4q5p Jan 29, 2026

Package
github.com/rancher/rancher (Go)

Affected versions
>=2.13.0, <2.13.2
>=2.12.0, <2.12.6
>=2.11.0, <2.11.10
>=2.10.0, <2.10.11

Patched versions
2.13.2
2.12.6
2.11.10
2.10.11


Description

Impact

A vulnerability has been identified within Rancher Manager, where 
using self-signed CA certificates and passing the -skip-verify flag to 
the Rancher CLI login command without also passing the –cacert flag 
results in the CLI attempting to fetch CA certificates stored in 
Rancher’s setting cacerts. This does not apply to any other commands 
and only applies to the login command if the –cacert flag was not 
provided.

An attacker with network-level access between the Rancher CLI and 
Rancher Manager could interfere with the TLS handshake to return a CA 
they control, despite the use of the --skip-verify flag. This may be 
abused to bypass TLS as a security control. Attackers can also see 
basic authentication headers in a Man-in-the-Middle due to the lack of 
TLS enforcement.

Please consult the associated MITRE ATT&CK - Technique - 
Man-in-the-Middle for further information about this category of 
attack.


Patches

This vulnerability is addressed by removing the ability to fetch CA 
certificates stored in Rancher’s setting cacerts when using the login 
command. Whenever required, for example when using self-signed 
certificates, CA certificates have to be explicitly passed with the 
–cacert flag.

Patched versions of Rancher include releases v2.13.2, v2.12.6, 
v2.11.10, and v2.10.11.


Workarounds

If you can't upgrade to a fixed version, please make sure whenever 
required, for example when using self-signed certificates, to always 
explicitly pass CA certificates with the –cacert flag when using the 
login command.


References

If you have any questions or comments about this advisory:

    Reach out to the SUSE Rancher Security team for security related 
inquiries.
    Open an issue in the Rancher repository.
    Verify with our support matrix and product support lifecycle.


Severity
High
8.4/ 10

CVSS v3 base metrics
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVE ID
CVE-2025-67601

Weaknesses
No CWEs


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