6.5
Medium
CVE-2025-23167 A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required…
Description
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. The issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination. Impact: * This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Node 20.0 | 20.0 → 20.19.1 | No fix stated |
| Node 19.0 | 19.0 → latest | No fix stated |
| Node 18.0 | 18.0 → latest | No fix stated |
| Node 17.0 | 17.0 → latest | No fix stated |
| Node 16.0 | 16.0 → latest | No fix stated |
| Node 15.0 | 15.0 → latest | No fix stated |
| Node 14.0 | 14.0 → latest | No fix stated |
| Node 13.0 | 13.0 → latest | No fix stated |
| Node 12.0 | 12.0 → latest | No fix stated |
Show the 8 other branches Hide the 8 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| Node 11.0 | 11.0 → latest | No fix stated |
| Node 10.0 | 10.0 → latest | No fix stated |
| Node 9.0 | 9.0 → latest | No fix stated |
| Node 8.0 | 8.0 → latest | No fix stated |
| Node 7.0 | 7.0 → latest | No fix stated |
| Node 6.0 | 6.0 → latest | No fix stated |
| Node 5.0 | 5.0 → latest | No fix stated |
| Node 4.0 | 4.0 → latest | No fix stated |
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