CVE-2026-77082

Summary

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 Software

Weaknesses

• CWE-1333: Inefficient Regular Expression Complexity

References

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

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