CVE-2026-86081 json
n8n: Regular Expression Denial of Service in the Default Blocked-File-Pattern Match via a Git Node Clone Path
published 2026-09-08 2 mo ago modified 2026-09-10 59 d ago also GHSA-j535-v25q-vx3q , EUVD-2026-74275
- cvss
- 7.1
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
n8n is an open source workflow automation platform. Prior to 1.123.76, 2.37.7, and 2.38.2, the Git node clone operation matched an attacker-controlled destination path against the default N8N_BLOCK_FILE_PATTERNS regular expression. The pattern ^(./).git(/.)$ allowed catastrophic backtracking and ran synchronously in the main n8n process. An authenticated workflow editor could therefore freeze the instance with one workflow execution; the affected default is declared in packages/@n8n/config/src/configs/security.config.ts. This issue is fixed in versions 1.123.76, 2.37.7 and 2.38.2.
Patch / fix
- npm n8n 1.123.76, 2.37.7, 2.38.2
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 1 mo ago
Exploit prediction
0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 7.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 4.0 | 7.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n | <1.123.76 >=2.38.0, <2.38.2 >=2.0.0, <2.37.7 |
1.123.76 2.38.2 2.37.7 |
Affected products
- n8n-io n8n
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
References
-
github.com
/n8n-io/n8n/security/advisories/GHSA-j535-v25q-vx3q
web
-
github.com
/n8n-io/n8n/releases/tag/n8n@1.123.76
web
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.37.7
web
-
github.com
/n8n-io/n8n/releases/tag/n8n@2.38.2
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-86081
advisory
-
github.com
/n8n-io/n8n
package
Sources
- CVE List CVE-2026-86081
- GitHub Advisory GHSA-j535-v25q-vx3q
- NVD CVE-2026-86081
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