Vulnerability · Published May 19, 2025 · Assigned by hackerone
CVE-2025-23167
Medium 6.5
In plain English
A medium-severity security flaw in node from nodejs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | nodejs | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | ALSA-2025:8514 |
| AlmaLinux:8 | nodejs-devel | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | ALSA-2025:8514 |
| AlmaLinux:8 | nodejs-docs | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | ALSA-2025:8514 |
| AlmaLinux:8 | nodejs-full-i18n | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | ALSA-2025:8514 |
| AlmaLinux:8 | nodejs-nodemon | 3.0.1-1.module_el8.10.0+3982+85c136aa | ALSA-2025:8514 |
| AlmaLinux:8 | nodejs-packaging | 2021.06-4.module_el8.10.0+3987+dbda4426 | ALSA-2025:8514 |
| AlmaLinux:8 | nodejs-packaging-bundler | 2021.06-4.module_el8.10.0+3958+472a6467 | ALSA-2025:8514 |
| AlmaLinux:8 | npm | 1:10.8.2-1.20.19.2.1.module_el8.10.0+4007+01f7d99b | ALSA-2025:8514 |
| Debian:12 | node-undici | no fix listed | DEBIAN-CVE-2025-23167 |
| Debian:13 | node-undici | no fix listed | DEBIAN-CVE-2025-23167 |
| Debian:14 | node-undici | 7.15.0+dfsg+~cs3.2.0-1 | DEBIAN-CVE-2025-23167 |
| Rocky Linux:8 | nodejs | 1:20.19.2-1.module+el8.10.0+1988+437f3d23 | RLSA-2025:8514 |
| Rocky Linux:9 | nodejs | 1:20.19.2-1.module+el9.6.0+32143+ae966e5b | RLSA-2025:8468 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1935+d3cbe60f | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1988+437f3d23 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1989+e60144d9 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.9.0+1760+903d54b9 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1666+930e28e8 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1667+4a788d89 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1823+b5789597 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1824+532140ee | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-nodemon | 0:3.0.1-1.module+el8.10.0+1924+614dc87f | RLSA-2025:8514 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.6.0+32144+1d29a396 | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.6.0+32045+2e5d342d | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.6.0+32322+a8b1fd01 | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.5.0+31770+0da7192d | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.6.0+32143+ae966e5b | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-nodemon | 0:3.0.1-1.module+el9.6.0+32185+bd121a25 | RLSA-2025:8468 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.10.0+1823+b5789597 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.10.0+1667+4a788d89 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.10.0+1824+532140ee | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.10.0+1924+614dc87f | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.10.0+1988+437f3d23 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.10.0+1989+e60144d9 | RLSA-2025:8514 |
| Rocky Linux:8 | nodejs-packaging | 0:2021.06-4.module+el8.9.0+1419+1f26ef47 | RLSA-2025:8514 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+32045+2e5d342d | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+32144+1d29a396 | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+32185+bd121a25 | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+32322+a8b1fd01 | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.5.0+31770+0da7192d | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+32143+ae966e5b | RLSA-2025:8468 |
| Rocky Linux:9 | nodejs-packaging | 0:2021.06-4.module+el9.6.0+32048+5323bb50 | RLSA-2025:8468 |
Affected products (as reported)
Weakness: CWE-444 · Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N