# CVE-2026-123039: Local privilege escalation to root in the DynamicCLI daemon via local world-writable control socket

> Any local user can send commands to a world-writable DynamicCLI socket to run them as root on Gaia OS.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Harmful if only installed:** No
- **Needs a specific call:** No
- **Fix available:** No
- **Published:** 12 Nov 2026
- **Updated:** 12 Nov 2026
- **Also known as:** GHSA-m95q-vgfj-2v8g

## What is CVE-2026-123039?

CVE-2026-123039 is a high-severity privilege escalation vulnerability in checkpoint Quantum Security Gateway, published on 12 Nov 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The Gaia OS DynamicCLI daemon runs as root and listens on a world-writable local socket (/tmp/dynamic_socket) without authenticating connecting processes. An authenticated local user can send a command to the socket and have it executed as root.

Weakness: CWE-862 (Missing Authorization), CWE-732 (Incorrect Permission Assignment for Critical Resource)

## Which versions are affected by CVE-2026-123039?

An affected version is exposed as installed. No special setting or call is needed.


## How do I fix CVE-2026-123039?

No fix has been published for CVE-2026-123039 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-123039 being exploited?

There is no known exploitation of CVE-2026-123039 in the wild and no public exploit code.

Public exploit code:

- Containerised PoC for CVE-2026-123039: the Check Point Gaia OS Dynamic CLI daemon publishes /tmp/dynamic_socket world-writable and authenticates no caller, so any local user escalates to root. Differential lab (affected vs patched), 4-mode PoC, 0day sweep. (github_poc): https://github.com/googlesky/CVE-2026-123039

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123039 and fix it if it is affected.

What it is: CVE-2026-123039 is a high-severity privilege escalation vulnerability in checkpoint Quantum Security Gateway, published on 12 Nov 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-123039 in the wild and no public exploit code.
Exposure: An affected version is exposed as installed. No special setting or call is needed.

Affected product: checkpoint Quantum Security Gateway. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-123039/ (Markdown: https://insights.sbomify.com/CVE-2026-123039/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123039
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123039
- OSV: https://osv.dev/vulnerability/CVE-2026-123039

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-123039/
Summaries are generated and may contain mistakes; the official description above is the record.