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Vulnerability details: VCID-rh43-8ugj-ufe3
Vulnerability ID VCID-rh43-8ugj-ufe3
Aliases CVE-2026-27496
GHSA-xvh5-5qg4-x9qp
Summary 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 `N8N_RUNNERS_ENABLED=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 (`N8N_RUNNERS_MODE=external`) to isolate the runner process. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-908 Use of Uninitialized Resource
System Score Found at
cvssv3.1 6.5 https://docs.n8n.io/hosting/configuration/task-runners
cvssv4 7.1 https://docs.n8n.io/hosting/configuration/task-runners
generic_textual HIGH https://docs.n8n.io/hosting/configuration/task-runners
cvssv3.1 6.5 https://docs.n8n.io/hosting/securing/blocking-nodes
cvssv4 7.1 https://docs.n8n.io/hosting/securing/blocking-nodes
generic_textual HIGH https://docs.n8n.io/hosting/securing/blocking-nodes
cvssv3.1 6.5 https://github.com/n8n-io/n8n
cvssv4 7.1 https://github.com/n8n-io/n8n
generic_textual HIGH https://github.com/n8n-io/n8n
cvssv3.1 6.5 https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
cvssv4 7.1 https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
generic_textual HIGH https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2026-27496
cvssv4 7.1 https://nvd.nist.gov/vuln/detail/CVE-2026-27496
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2026-27496
Reference id Reference type URL
https://docs.n8n.io/hosting/configuration/task-runners
https://docs.n8n.io/hosting/securing/blocking-nodes
https://github.com/n8n-io/n8n
https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
https://nvd.nist.gov/vuln/detail/CVE-2026-27496
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://docs.n8n.io/hosting/configuration/task-runners
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: 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 Found at https://docs.n8n.io/hosting/configuration/task-runners
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://docs.n8n.io/hosting/securing/blocking-nodes
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: 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 Found at https://docs.n8n.io/hosting/securing/blocking-nodes
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/n8n-io/n8n
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: 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 Found at https://github.com/n8n-io/n8n
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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Vector: 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 Found at https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27496
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

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Vector: 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 Found at https://nvd.nist.gov/vuln/detail/CVE-2026-27496
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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No EPSS data available for this vulnerability.

Date Actor Action Source VulnerableCode Version
2026-06-04T16:58:54.934923+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-xvh5-5qg4-x9qp/GHSA-xvh5-5qg4-x9qp.json 38.6.0