High · CVSS 8.9CVE-2026-65591

n8n before 1.123.64 Sanitizer Bypass Remote Code ExecutionCVE-2026-65591

Answer in brief

CVE-2026-65591 records a High severity (CVSS 8.9) vulnerability in n8n before 1.123.64 Sanitizer Bypass Remote Code Execution. The current sources do not mark it as known exploited. The current feed maps n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 22, 2026Updated Oct 29, 2026Source checked Oct 29, 2026First seen by HOL Oct 28, 2026Material review Oct 29, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.9
Exploitation: Not marked as known exploited
Affected software: 7 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n8n-io/n8n (generic), n8n-io/n8n (generic), n8n-io/n8n (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:a:n8n:n8n:2.30.0::::community:node.js::*	Not reported	Not reported
cpe:2.3:a:n8n:n8n:2.30.0::::enterprise:node.js::*	Not reported	Not reported
cpe:2.3:a:n8n:n8n:::::community:node.js::	Not reported	Not reported
cpe:2.3:a:n8n:n8n:::::enterprise:node.js::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
n8n-io/n8ngeneric	>=0 <1.123.64	1.123.64
n8n-io/n8ngeneric	>=2.30.0 <2.30.1	2.30.1
n8n-io/n8ngeneric	>=2.0.0-rc.0 <2.29.8	2.29.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for n8n-io/n8n, n8n-io/n8n, n8n-io/n8n.
Review the reported fix. Update n8n-io/n8n to 1.123.64; n8n-io/n8n to 2.30.1; n8n-io/n8n to 2.29.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jul 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 28, 2026

Sources and claim methodology

Upstream source description

n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.

Quoted source text, attributed separately from HOL analysis.