# 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 `\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.

CVE-2025-23167 is fixed in 20 products on 2 platforms, first by Node.js 20 20.19.2, released May 14, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-23167
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 19, 2025
- Weakness: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Node.js 20 | 20.19.2 | [Node.js 20 20.19.2](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.20-20.19.2.md) | May 14, 2025 |
| Linux | node-undici Debian 14 | 7.15.0+dfsg+~cs3.2.0-1 | [DEBIAN-CVE-2025-23167](https://patchblox.com/security/data/fix/linux/debian-cve-2025-23167.md) | May 19, 2025 |
| Linux | nodejs RHEL 8 | 1:20.19.2-1.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs RHEL 9 | 1:20.19.2-1.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs almalinux 8 | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs rocky 8 | 1:20.19.2-1.module+el8.10.0+1988+437f3d23 | [RLSA-2025:8514](https://patchblox.com/security/data/fix/linux/rlsa-2025-8514.md) | Jul 29, 2025 |
| Linux | nodejs rocky 9 | 1:20.19.2-1.module+el9.6.0+32143+ae966e5b | [RLSA-2025:8468](https://patchblox.com/security/data/fix/linux/rlsa-2025-8468.md) | Jul 29, 2025 |
| Linux | nodejs-devel RHEL 8 | 1:20.19.2-1.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-devel RHEL 9 | 1:20.19.2-1.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs-devel almalinux 8 | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-docs RHEL 8 | 1:20.19.2-1.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-docs RHEL 9 | 1:20.19.2-1.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs-docs almalinux 8 | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-full-i18n RHEL 8 | 1:20.19.2-1.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-full-i18n RHEL 9 | 1:20.19.2-1.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs-full-i18n almalinux 8 | 1:20.19.2-1.module_el8.10.0+4007+01f7d99b | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-nodemon RHEL 8 | 0:3.0.1-1.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-nodemon RHEL 9 | 0:3.0.1-1.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs-nodemon almalinux 8 | 3.0.1-1.module_el8.10.0+3982+85c136aa | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-nodemon rocky 8 | 0:3.0.1-1.module+el8.10.0+1988+437f3d23 | [RLSA-2025:8514](https://patchblox.com/security/data/fix/linux/rlsa-2025-8514.md) | Jul 29, 2025 |
| Linux | nodejs-nodemon rocky 9 | 0:3.0.1-1.module+el9.5.0+31770+0da7192d | [RLSA-2025:8468](https://patchblox.com/security/data/fix/linux/rlsa-2025-8468.md) | Jul 29, 2025 |
| Linux | nodejs-packaging RHEL 8 | 0:2021.06-4.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-packaging RHEL 9 | 0:2021.06-4.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs-packaging almalinux 8 | 2021.06-4.module_el8.10.0+3987+dbda4426 | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-packaging rocky 8 | 0:2021.06-4.module+el8.10.0+1667+4a788d89 | [RLSA-2025:8514](https://patchblox.com/security/data/fix/linux/rlsa-2025-8514.md) | Jul 29, 2025 |
| Linux | nodejs-packaging rocky 9 | 0:2021.06-4.module+el9.5.0+31770+0da7192d | [RLSA-2025:8468](https://patchblox.com/security/data/fix/linux/rlsa-2025-8468.md) | Jul 29, 2025 |
| Linux | nodejs-packaging-bundler RHEL 8 | 0:2021.06-4.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs-packaging-bundler RHEL 9 | 0:2021.06-4.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | nodejs-packaging-bundler almalinux 8 | 2021.06-4.module_el8.10.0+3958+472a6467 | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | nodejs20 amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20 opensuse-leap 15.6 | 20.19.2-150600.3.12.1 | [SUSE-SU-2025:02045-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02045-1.md) | Jun 20, 2025 |
| Linux | nodejs20 sles 15.6 | 20.19.2-150600.3.12.1 | [SUSE-SU-2025:02045-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-02045-1.md) | Jun 20, 2025 |
| Linux | nodejs20-debuginfo amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-debugsource amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-devel amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-docs amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-full-i18n amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-libs amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-libs-debuginfo amzn 2023 | 1:20.19.2-1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | nodejs20-npm amzn 2023 | 1:10.8.2-1.20.19.2.1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |
| Linux | npm RHEL 8 | 1:10.8.2-1.20.19.2.1.module+el8.10.0+23139+21ba74c5 | [RHSA-2025:8514](https://patchblox.com/security/data/fix/linux/rhsa-2025-8514.md) | Jun 4, 2025 |
| Linux | npm RHEL 9 | 1:10.8.2-1.20.19.2.1.module+el9.6.0+23146+be9976bd | [RHSA-2025:8468](https://patchblox.com/security/data/fix/linux/rhsa-2025-8468.md) | Jun 3, 2025 |
| Linux | npm almalinux 8 | 1:10.8.2-1.20.19.2.1.module_el8.10.0+4007+01f7d99b | [ALSA-2025:8514](https://patchblox.com/security/data/fix/linux/alsa-2025-8514.md) | Jun 4, 2025 |
| Linux | v8-11.3-devel amzn 2023 | 3:11.3.244.8-1.20.19.2.1.amzn2023.0.1 | [ALAS2023-2025-1010](https://patchblox.com/security/data/fix/linux/alas2023-2025-1010.md) | Jun 4, 2025 |

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