CVE-2026-118678
n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows…
- Risk score
- 43/100
- CVSS
- 7.1 v3.1
- Published
- 28 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction t…
- Affected
- See advisory
- Fix
- Upgrade the product to 2.41.4, 2.42 or 2.42.1 (whichever matches your release line), or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 7.1 high
References
Original description
n8n before 2.41.4 and 2.42.x before 2.42.1 contains a prototype pollution vulnerability that allows low-privileged users to alter built-in object behaviour by saving workflows with specially named connection keys. Attackers can add keys such as __proto__ to workflow connections, which the periodic history compaction task processes, causing logins and writes to fail with server errors.
Last activity 28 Oct 2026. Patch Forecast updates every hour.