GHSA-hw8v-xxg5-vvvx
GHSA-hw8v-xxg5-vvvx is a Code Injection vulnerability in n8n. O3 Security confirms whether GHSA-hw8v-xxg5-vvvx is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
n8n: Expression Sandbox Escape via Class-Field Sanitizer Rebinding Can Lead to Code Execution
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 GHSA-hw8v-xxg5-vvvx.
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
n8nnpmDescription
Impact
The expression compiler's sanitizer resolved through a dynamically-scoped this, so a class field named __sanitize rebound it and reached the Function constructor. On the backend, any expression author could run code in the n8n process; in the editor preview, a member's expression could run as JavaScript in the session of whoever opened the workflow. The patch rejects reserved class-member names.
Patches
The issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. Users should upgrade to one of these versions or later to remediate the vulnerability.
Workarounds
If upgrading is not immediately possible, administrators should consider the following temporary mitigations:
- Restrict n8n instance access to fully trusted users only.
- Avoid granting workflow-create or workflow-edit permissions to untrusted users.
- Audit existing workflows for unexpected or unfamiliar expressions in node parameters.
- Set
N8N_EXPRESSION_ENGINE=vm.
These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | n8n | all versions | 1.123.76 |
| 📦npm | n8n | ≥ 2.38.0&&< 2.38.2 | 2.38.2 |
| 📦npm | n8n | ≥ 2.0.0&&< 2.37.7 | 2.37.7 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for n8n. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update n8n to 1.123.76 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hw8v-xxg5-vvvx 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.
How O3 protects you
O3 pinpoints whether GHSA-hw8v-xxg5-vvvx is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-hw8v-xxg5-vvvx. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-hw8v-xxg5-vvvx in your dependencies?
O3 detects GHSA-hw8v-xxg5-vvvx across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.