CVE-2026-1531 is a high-severity (CVSS 8.1) CWE-295 vulnerability in foreman_kubevirt. A fix is available for foreman_kubevirt — see the affected versions and patch details below.
foreman_kubevirt disables SSL verification if a Certificate Authority (CA) certificate is not explicitly set
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-1531.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
foreman_kubevirtReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
A flaw was found in foreman_kubevirt. When configuring the connection to OpenShift, the system disables SSL verification if a Certificate Authority (CA) certificate is not explicitly set. This insecure default allows a remote attacker, capable of intercepting network traffic between Satellite and OpenShift, to perform a Man-in-the-Middle (MITM) attack. Such an attack could lead to the disclosure or alteration of sensitive information.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | foreman_kubevirt | all versions | 0.4.3bundle update foreman_kubevirt --conservative |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for foreman_kubevirt, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update foreman_kubevirt to 0.4.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-1531 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This is an IMPORTANT flaw in foreman_kubevirt where the default configuration for connecting to OpenShift disables SSL verification if a CA certificate is not explicitly provided. This insecure default allows a remote attacker to perform a Man-in-the-Middle attack by intercepting network traffic between Satellite and…
To mitigate this issue, ensure that a Certificate Authority (CA) certificate is explicitly configured when setting up the connection to OpenShift in foreman_kubevirt. This will enable SSL verification and prevent Man-in-the-Middle attacks. Refer to the foreman_kubevirt documentation for specific instructions on configuring CA certificates. A restart or service reload may be required for the changes to take effect.Source: Red Hat security advisory for CVE-2026-1531 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Satellite 6.16 for RHEL 8 | rubygem-foreman_kubevirt-0:0.2.0-2.el8sat | RHSA-2026:5971 |
| Red Hat Satellite 6.17 for RHEL 9 | foreman-0:3.14.0.14-1.el9sat | RHSA-2026:5970 |
| Red Hat Satellite 6.18 for RHEL 9 | rubygem-foreman_kubevirt-0:0.4.3-1.el9sat | RHSA-2026:5968 |
Frequently Asked Questions
Is CVE-2026-1531 in your dependencies?
Find it across RubyGems, including transitive dependencies.