What’s Vulnerable › Vulnerabilities

CVE-2021-21297: Prototype Pollution in Node-Red

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-26 · updated 2026-06-17
• Weakness: CWE-915

Description

Node-Red is a low-code programming for event-driven applications built using nodejs. Node-RED 1.2.7 and earlier contains a Prototype Pollution vulnerability in the admin API. A badly formed request can modify the prototype of the default JavaScript Object with the potential to affect the default behaviour of the Node-RED runtime. The vulnerability is patched in the 1.2.8 release. A workaround is to ensure only authorized users are able to access the editor url.

Affected products

• node-red: before 1.2.8 — fixed in 1.2.8

How to fix

Upgrade to a fixed version: node-red 1.2.8. Check the vendor advisory for mitigations.

References

• https://github.com/node-red/node-red/releases/tag/1.2.8
• https://github.com/node-red/node-red/security/advisories/GHSA-xp9c-82x8-7f67
• https://www.npmjs.com/package/%40node-red/editor-api
• https://www.npmjs.com/package/%40node-red/runtime
• https://github.com/node-red/node-red/releases/tag/1.2.8
• https://github.com/node-red/node-red/security/advisories/GHSA-xp9c-82x8-7f67
• https://www.npmjs.com/package/%40node-red/editor-api
• https://www.npmjs.com/package/%40node-red/runtime

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