CVE-2026-77082
n8n before 1.123.69, 2.x before 2.33.4, and 2.34.x before 2.34.1 contains a regular expression denial of service (ReDoS) vulnerability in the Filter and Switch nodes, which compile user-supplied regex patterns with new RegExp() and execute them synchronously on the worker thread without complexity validation or execution timeout. A crafted regex pattern can block the worker for an extended period per data item processed, delaying other workflow executions on the same worker.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5.3
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- EPSS probability
- 0.27%
- CWE
- CWE-1333
- Published
- 2026-08-20
- Last modified
- 2026-08-21
Affected products
- n8n-io n8n
- n8n-io n8n
- n8n-io n8n
- n8n-io n8n
- n8n-io n8n
- n8n-io n8n
Weakness type
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