CVE-2026-86083 json
n8n: Expression Sandbox Escape via Shared Builtin Tampering and Code-Printer Injection Leads to Code Execution
published 2026-09-08 2 mo ago modified 2026-09-11 58 d ago also GHSA-6xcw-7xm6-48c6 , EUVD-2026-74273
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 52%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm n8n 1.123.76, 2.37.7, 2.38.2
- n8n n8n 1.123.76, 2.37.7, 2.38.2
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 1 mo ago
Exploit prediction
0.66% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.7 | 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 |
| CNA | 4.0 | 7.7 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | <1.123.76 >=2.38.0, <2.38.2 >=2.0.0, <2.37.7 |
1.123.76 2.38.2 2.37.7 |
Affected products
- n8n-io n8n
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
-
github.com
/n8n-io/n8n/security/advisories/GHSA-6xcw-7xm6-48c6
web, mitigation, vendor-advisory
-
github.com
/n8n-io/n8n/releases/tag/n8n@1.123.76
web, release-notes
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.37.7
web, release-notes
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.38.2
web, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-86083
advisory
-
github.com
/n8n-io/n8n
package
Sources
- CVE List CVE-2026-86083
- GitHub Advisory GHSA-6xcw-7xm6-48c6
- NVD CVE-2026-86083
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.