# CVE-2026-77082

## Summary

- **CVE ID:** CVE-2026-77082
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (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)
- **CWE:** CWE-1333
- **Published:** Aug 20, 2026
- **Last Modified:** Aug 21, 2026

## Description

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.

## Affected Products

- n8n-io — n8n (0)
- n8n-io — n8n (1.123.69)
- n8n-io — n8n (2.34.1)
- n8n-io — n8n (2.33.4)
- n8n-io — n8n (2.34.0)
- n8n-io — n8n (2.0.0)

## References

- [CNA](https://github.com/n8n-io/n8n/security/advisories/GHSA-q3fv-295f-qfpf)
- [CNA](https://www.vulncheck.com/advisories/n8n-before-redos-via-filter-and-switch-node)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._