CVE-2026-96658 — Red Hat
CRITICALCVE-2026-96658 is a critical-severity (CVSS 9.9) Code Injection vulnerability. No vendor fix is recorded yet; mitigation options are listed below.
A flaw was found in Foreman. An authenticated attacker with low-level permissions can achieve remote code execution (RCE) by bypassing the safemode sandbox within the templating engine.…
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-2026-96658.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-96658 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 381,682 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
A flaw was found in Foreman. An authenticated attacker with low-level permissions can achieve remote code execution (RCE) by bypassing the safemode sandbox within the templating engine. Due to improper handling of delegated methods, an attacker can append unauthorized functions to the allowed execution list, enabling them to run arbitrary commands on the hosting server.
Detection & mitigation playbook
VulnerabilityDetect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2026-96658 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
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.
Red Hat Product Security rates this vulnerability as having a Critical security impact because an authenticated user with minimal read permissions can achieve arbitrary remote code execution on the underlying Satellite server. In Red Hat Satellite deployments, Foreman relies on a restricted sandbox to safely render…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Satellite 6.16 for RHEL 8 | rubygem-safemode-0:1.5.0-2.el8sat | RHSA-2026:74506 |
| Red Hat Satellite 6.18 for RHEL 9 | rubygem-safemode-0:1.5.0-2.el9sat | RHSA-2026:74504 |
| Red Hat Satellite 6.19 for RHEL 9 | foreman-0:3.18.0.14-1.el9sat | RHSA-2026:74503 |
Frequently Asked Questions
Is CVE-2026-96658 in your dependencies?
Find it across , including transitive dependencies.