CVE-2026-86083

n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Leads to Code Execution

HIGH

8.8

CVSS Score

Published: September 8, 2026 at 09:22 PM UTC

Updated: September 11, 2026 at 04:30 PM UTC

2 products affected across 2 vendorsN8NN8N

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Severity

HIGH8.8

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the legacy expression engine generated source text by calling the mutable global JSON.stringify while printing synthetic string literals and interpolating timezone data. An expression could replace JSON.stringify and cause later generated source to contain executable attacker-controlled code. The affected code-generation paths include packages/@n8n/expression-runtime/src/bridge/isolated-vm-bridge.ts and packages/@n8n/tournament/src/ExpressionBuilder.ts, and the issue does not affect the vm expression engine. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

N8N · N8Nnpm

95%

v < 1.123.762.0.0 ≤ v < 2.37.72.38.0 ≤ v < 2.38.2

Affected range stops below 1.123.76, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.37.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.38.2, so it looks safe — our inference, not a vendor statement

N8N · N8N Io

60%

v < 1.123.76v < 2.37.7v < 2.38.2

Affected range stops below 1.123.76, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.37.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 2.38.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/n8n-io/n8n/security/advisories/GHSA-6xcw-7xm6-48c6

References (4)

x_refsource_CONFIRMMitigationVendor Advisory

Source: cverecord

https://github.com/n8n-io/n8n/security/advisories/GHSA-6xcw-7xm6-48c6

x_refsource_MISCRelease Notes

Source: cverecord

https://github.com/n8n-io/n8n/releases/tag/[email protected]

x_refsource_MISCRelease Notes

Source: cverecord

https://github.com/n8n-io/n8n/releases/tag/[email protected]

x_refsource_MISCRelease Notes

Source: cverecord

https://github.com/n8n-io/n8n/releases/tag/[email protected]

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-94

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