CVE-2026-86075Suited to automated attack · CISA

n8n: Unauthenticated Persistent Storage Exhaustion via OAuth Dynamic Client Registration Endpoint

CVSS score

8.7

EPSS probability

%0.6

Risk score

0.1

Published

1 mo ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-86075 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the OAuth Dynamic Client Registration endpoint bounded redirect_uris but accepted arbitrarily large client_name and grant_types values. An unauthenticated remote caller could repeatedly persist oversized values in oauth_clients and exhaust database storage. The affected validation is in packages/cli/src/modules/oauth-server/oauth-server.service.ts, including MAX_CLIENT_NAME_LENGTH and MAX_GRANT_TYPES. This issue is fixed in versions 2.37.7 and 2.38.2.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-86075 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	n8n-io	n8n	View
2	n8n	n8n	View
3	n8n	n8n	View
4	npm	n8n	View
5	npm	n8n	View
6	npm	n8n	View
7	npm	n8n	View

Total affected vendors: 3|Products: 7

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
8.7	CVSS V4_0	HIGH	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CVE CNA
8.7	CVSS V40	HIGH	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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	NVD
8.7	CVSS 4.0	—	Vector not published	GitHub Advisory
7.5	CVSS V31	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

4 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

osvn8n2.38.2

OSV düzeltilmiş sürüm: 2.38.2

osvn8n2.37.7

OSV düzeltilmiş sürüm: 2.37.7

gitlabnpm/n8n2.37.7

GitLab Advisory düzeltilmiş sürüm: 2.37.7

gitlabnpm/n8n2.38.2

GitLab Advisory düzeltilmiş sürüm: 2.38.2

gitlab

Upgrade to versions 2.37.7, 2.38.2 or above.

canonical

Upgrade to versions 2.37.7, 2.38.2 or above.

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-86075 is associated with the following CWEs:

CWE-770: Allocation of Resources Without Limits or Throttling CWE-937: Common Weakness Enumeration Entry CWE-937 CWE-1035: Common Weakness Enumeration Entry CWE-1035

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-86075 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

https://github.com/n8n-io/n8n/security/advisories/GHSA-hh89-3r9w-qj3jvendor-advisory https://github.com/n8n-io/n8n/releases/tag/n8n@2.37.7vendor-advisory https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2vendor-advisory https://nvd.nist.gov/vuln/detail/CVE-2026-86075vendor-advisory https://github.com/advisories/GHSA-hh89-3r9w-qj3jvendor-advisory https://github.com/n8n-io/n8nvendor-advisory

CVSS Vector Radar Chart

8.7 / 10

Vulnerability Scoring Details

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Yama doğrulandı

4 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

n8n-io

n8n

npm

Weakness Type (CWE & CAPEC)

CWE-770 CWE-937 CWE-1035

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