# CVE-2026-86083 — n8n-io n8n

> As of 2026-09-09, CVE-2026-86083 is a High-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in n8n-io n8n, CVSS v4.0 7.7, EPSS 0.2% (20.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-86083 as of 2026-09-09; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-09

## What is CVE-2026-86083?

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.

The record classifies CVE-2026-86083 under weakness class [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 27 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 7.7 — High (derived from score) (`CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 20.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-08, last modified 2026-09-09

## Is CVE-2026-86083 being exploited?

It currently carries a trending score of 35 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [n8n-io](https://intel.threadlinqs.com/vendors/n8n-io): n8n

## How to fix CVE-2026-86083

No vendor patch reference has been recorded for CVE-2026-86083 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-86083

No threat campaign in the Threadlinqs corpus currently references CVE-2026-86083, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-09-09.

**Vendor advisory and patch**

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

**Other references**

- [github.com](https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.76)
- [github.com (n8n@2.37)](https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7)
- [github.com (n8n@2.38)](https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-86083
Full detection coverage and IOCs for threats exploiting CVE-2026-86083 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp