| Severity |
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| Remote |
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| Type |
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Access restriction bypass |
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| Description |
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A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using \r\n\rX instead of the required \r\n\r\n. This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. |
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The issue was resolved by upgrading llhttp to version 9, which enforces correct header termination. |
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| References |
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https://nodejs.org/en/blog/vulnerability/may-2025-security-releases#improper-http-header-block-termination-in-llhttp-cve-2025-23167---medium |
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| Notes |
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This vulnerability affects only Node.js 20.x users prior to the llhttp v9 upgrade. |
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