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.
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