CVE-2026-77082CWE-1333

CVE-2026-77082

Medium · published August 20, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
39.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
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
EPSS
0.00472 · 39.8th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2026-08-20T16:16Z
Affected products (3)
ProductVersionsFixed in
n8n/n8n< 1.123.691.123.69
n8n/n8n≥ 2.0.0, < 2.33.42.33.4
n8n/n8nall versions—
References (2)
https://github.com/n8n-io/n8n/security/advisories/GHSA-q3fv-295f-qfpf · [email protected]https://www.vulncheck.com/advisories/n8n-before-redos-via-filter-and-switch-node · [email protected]
EPSS history
Timeline
  • 20 AUG 11:21Z
    n8n before 1.123.69 ReDoS via Filter and Switch Node
    cvelistv5