CVE-2026-65591: n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler

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HIGH 8.8UPGRADE

CVE-2026-65591 is a high-severity flaw (CVSS 8.8) affecting n8n. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achieve host-level code execution as the n8n process. The legacy expression engine is the default in affected versions. Fixed in n8n 1.123.64, 2.29.8, and 2.30.1.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-917
Published	2026-07-22
Last modified	2026-10-24

Publisher (CNA): VulnCheck · Vendor: n8n

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-22 12:18 UTCPublished CVE record published
2026-10-24 17:10 UTCUpdated Record last modified

n8n n8n UPGRADE

Affected: < 1.123.64 · >= 2.0.0 and < 2.29.8 · 2.30.0

Fixed in: 1.123.64, 2.29.8

Safe to downgrade to: a release before 2.0.0

1. Check installed version

npm ls n8n

2. UPGRADE to 1.123.64

npm install n8n@">=1.123.64"

3. If no update is available yet, DOWNGRADE to a release before 2.0.0

npm view n8n versions npm install n8n@"<2.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

npm · n8n · FIXED · 1.123.64 · vulnerable: < 1.123.64 · source

npm install n8n@">=1.123.64" npm ls n8n

Fedora 46 · newscache · FIXED · 1.3.22-1.fc46 · FEDORA-2026-49b088f8ca · source

sudo dnf upgrade --advisory=FEDORA-2026-49b088f8ca

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: IamDremig/CVE-2026-65591 (1 stars)

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-65591?

n8n: upgrade to 1.123.64, 2.29.8. Exact commands for each OS are on this page.

Is CVE-2026-65591 being exploited?

CVE-2026-65591 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-65591 affect?

CVE-2026-65591 affects n8n. Severity is high (CVSS 8.8). n8n contains a sanitizer bypass vulnerability in the legacy expression evaluator's computed-member handler. An authenticated user with workflow create or modify permissions can craft a malicious expression to bypass the sanitizer and achiev

How urgent is CVE-2026-65591?

Priority 44/100. High severity

Related CVEs

CVE-2026-65590 CRITICAL 9.8 UPGRADE n8n before 2.29.8 and 2.30.x before 2.30.1 does not enforce shell sandbox restrictions on Linux and Windows in
CVE-2026-65595 HIGH 8.8 UPGRADE n8n before 2.30.1 and 2.29.8 assigns all Public API key scopes to JWTs issued through the Token Exchange modul
CVE-2026-65015 HIGH 8.8 UPGRADE n8n versions before 2.30.1 contain a privilege escalation vulnerability in the AI Agents feature where the nod
CVE-2026-65016 HIGH 8.8 UPGRADE n8n versions before 1.123.64, 2.29.8, and 2.30.1 contain a privilege escalation vulnerability in Enterprise SS
CVE-2026-65596 HIGH 8.1 UPGRADE n8n before 1.123.64, 2.29.8, and 2.30.1 fails to enforce the "Allowed HTTP Request Domains" restriction on HTT

References

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