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.
Metrics
Affected Vendors & Products
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Wed, 28 Oct 2026 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction | |
| First Time appeared |
N8n
N8n n8n |
|
| Weaknesses | CWE-1321 | |
| CPEs | cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:* | |
| Vendors & Products |
N8n
N8n n8n |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-28T18:59:50.449Z
Reserved: 2026-10-28T17:28:46.441Z
Link: CVE-2026-118678
No data.
Status : Deferred
Published: 2026-10-28T19:17:33.957
Modified: 2026-10-28T19:17:34.077
Link: CVE-2026-118678
No data.
OpenCVE Enrichment
Updated: 2026-10-28T20:30:07Z
Weaknesses