CVE-2025-23167

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.

Reserved 2025-01-12 | Published 2025-05-19 | Updated 2025-05-27 | Assigner hackerone

Product status

Default status
unaffected

4.0 before 4.*
affected

5.0 before 5.*
affected

6.0 before 6.*
affected

7.0 before 7.*
affected

8.0 before 8.*
affected

9.0 before 9.*
affected

10.0 before 10.*
affected

11.0 before 11.*
affected

12.0 before 12.*
affected

13.0 before 13.*
affected

14.0 before 14.*
affected

15.0 before 15.*
affected

16.0 before 16.*
affected

17.0 before 17.*
affected

18.0 before 18.*
affected

19.0 before 19.*
affected

20.0
affected

References

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

cve.org (CVE-2025-23167)

nvd.nist.gov (CVE-2025-23167)

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