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CVE

CVE-2026-27496

n8n has In-Process Memory Disclosure in its Task Runner
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CVE

CVE-2026-27496

n8n has In-Process Memory Disclosure in its Task Runner

Impact

An authenticated user with permission to create or modify workflows could use the JavaScript Task Runner to allocate uninitialized memory buffers. Uninitialized buffers may contain residual data from the same Node.js process — including data from prior requests, tasks, secrets, or tokens — resulting in information disclosure of sensitive in-process data.

  • Task Runners must be enabled using N8NRUNNERSENABLED=true.
  • In external runner mode, the impact is limited to data within the external runner process.

Patches

The issue has been fixed in n8n versions >= 1.123.22, >= 2.10.1 , and >= 2.9.3. Users should upgrade to this version or later to remediate the vulnerability.

Workarounds

If upgrading is not immediately possible, administrators should consider the following temporary mitigations:

  • Limit workflow creation and editing permissions to fully trusted users only.
  • Use external runner mode (N8NRUNNERSMODE=external) to isolate the runner process.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.1
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
C
H
U
6.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Related Resources

No items found.

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp, https://nvd.nist.gov/vuln/detail/CVE-2026-27496, https://docs.n8n.io/hosting/configuration/task-runners, https://docs.n8n.io/hosting/securing/blocking-nodes, https://github.com/n8n-io/n8n

Severity

6.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
6.5
EPSS Probability
0.00041%
EPSS Percentile
0.12633%
Introduced Version
0,2.10.0,2.0.0-rc.0,1.3.0
Fix Available
1.123.22,2.10.1,2.9.1,1.59.16

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