CVE-2025-23167

6.5 mediumEPSS 0.5%

Medium (6.5). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.0

6.5 medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-444
Published: 2025-05-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://nodejs.org/en/blog/vulnerability/may-2025-security-releases

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