Custom Header Credential Values Leaked in Plaintext into LLM Node Execution Data
- Product
- n8n
- CVE
- CVE-2026-65589
- Affected
- npm/n8n affected < 1.123.64; npm/n8n affected >= 2.0.0-rc.0, < 2.29.8; npm/n8n affected >= 2.30.0, < 2.30.1
- Fixed in
- 1.123.64
Last verified against sources: October 26, 2026
Am I affected?
n8n: affected npm/n8n affected < 1.123.64; npm/n8n affected >= 2.0.0-rc.0, < 2.29.8; npm/n8n affected >= 2.30.0, < 2.30.1. Fixed in 1.123.64.
- Check your version: run
npm ls n8n. Versions < 1.123.64 of n8n are affected. [1]
What to do now
- Upgrade to the fixed version: run
npm install n8n@1.123.64(first patched version 1.123.64). [1] - Upgrade to one of these versions or later to remediate the vulnerability. [1]
- Restrict access to execution data to fully trusted users only. [1]
- Avoid configuring custom headers in LLM node credentials; use alternative authentication mechanisms where possible. [1]
- Rotate any API keys or secrets that may have been stored as custom header values in affected credentials. [1]
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
What happened
- Custom HTTP headers configured in credentials for certain LLM sub-nodes (including OpenAI, Anthropic, and Lemonade) are masked in the n8n UI but are written in plaintext into execution data during workflow runs. [1]
Impact
What was done
Sources
- GHSA-89gh-3pgc-v5h2 — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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[CVE-2026-65589] Custom Header Credential Values Leaked in Plaintext into LLM Node Execution Data
Product: n8n | Affected: npm/n8n affected < 1.123.64; npm/n8n affected >= 2.0.0-rc.0, < 2.29.8; npm/n8n affected >= 2.30.0, < 2.30.1 | Fixed in: 1.123.64
Summary: Custom HTTP headers configured in credentials for certain LLM sub-nodes (including OpenAI, Anthropic, and Lemonade) are masked in the n8n UI but are written in plaintext into execution data during workflow runs.
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/07/cve-2026-65589-n8nCorrections
Report an error or request a correction. We review requests within 5 business days and add a dated correction note.
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