What’s Vulnerable › Vulnerabilities
CVE-2025-23167
- Severity: medium (CVSS 6.5 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-05-19 · updated 2026-06-17
- Weakness: CWE-444
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
- Node.js: 4.x from 4.0; 5.x from 5.0; 6.x from 6.0; 7.x from 7.0; 8.x from 8.0; 9.x from 9.0
References
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