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Public proof of conceptFix available

CVE-2026-0863

A public proof of concept exists; no exploitation attested.

  • Published2026-01-18
  • WeaknessCWE-94 · CWE-95

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Using string formatting and exception handling, an attacker may bypass n8n's python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system. The vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under "Internal" execution mode. If the instance is operating under the "External" execution mode (ex. n8n's official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.

Timeline

dates in UTC
  1. 2026-01-1816:15CVE publishedNVD

Versions per branch

NVD
N8n
BranchAffectedFixed in
1.123≤ 1.123.14no fix published
2.x≥ 2.0.0, ≤ 2.3.5no fix published
2.4≥ 2.4.0, ≤ 2.4.2no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As JFROG, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • n8n

    https://www.npmjs.com

    Affected
    • ≥ 2.4.0, < 2.4.2fixed in 2.4.2semver
    • < 1.123.14fixed in 1.123.14semver
    • ≥ 2.0.0, < 2.3.5fixed in 2.3.5semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-18

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2026-01-20
  • CNACVSS 3.18.5known since 2026-10-23
  • NVDCVSS 3.19.9read 2026-10-23
  • CNAweakness (CWE)CWE-95known since 2026-10-23
  • NVDweakness (CWE)CWE-94read 2026-10-23
  • FIRST EPSSEPSS score9.3 %2026-11-08
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
2026-01-18
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-j6wg-29xj-2fjf

Frequently asked questions

What is CVE-2026-0863?

Using string formatting and exception handling, an attacker may bypass n8n's python-task-executor sandbox restrictions and run arbitrary unrestricted Python code in the underlying operating system. The vulnerability can be exploited via the Code block by an authenticated user with basic permissions and can lead to a full n8n instance takeover on instances operating under "Internal" execution mode. If the instance is operating under the "External" execution mode (ex. n8n's official Docker image) - arbitrary code execution occurs inside a Sidecar container and not the main node, which significantly reduces the vulnerability impact.

Is CVE-2026-0863 actively exploited?

A proof-of-concept exploit exists for CVE-2026-0863, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-0863?

CVE-2026-0863 has a CVSS v3 base score of 9.9 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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