# CVE-2023-23936: CRLF Injection in Nodejs ‘undici’ via host

CVE-2023-23936 is fixed in 13 products on 2 platforms, first by Node.js 16 16.19.1, released February 16, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-23936
- Priority: High
- CVSS: 8.6 (Moderate)
- EPSS: 0.0113
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 16, 2023
- Weakness: CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-23936

## Description

Undici is an HTTP/1.1 client for Node.js. Starting with version 2.0.0 and prior to version 5.19.1, the undici library does not protect `host` HTTP header from CRLF injection vulnerabilities. This issue is patched in Undici v5.19.1. As a workaround, sanitize the `headers.host` string before passing to undici.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Node.js 16 | 16.19.1 | [Node.js 16 16.19.1](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.16-16.19.1.md) | Feb 16, 2023 |
| Windows apps | Node.js 18 | 18.14.1 | [Node.js 18 18.14.1](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.18-18.14.1.md) | Feb 16, 2023 |
| Windows apps | Node.js 19 | 19.6.1 | [Node.js 19 19.6.1](https://patchblox.com/security/data/fix/windows-app/openjs.nodejs.19-19.6.1.md) | Feb 16, 2023 |
| Linux | node-undici Debian 12.15 (bookworm) | 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u1 | [DEBIAN-CVE-2023-23936](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23936.md) | Feb 16, 2023 |
| Linux | node-undici Debian 13.5 (trixie) | 5.19.1+dfsg1+~cs20.10.9.5-1 | [DEBIAN-CVE-2023-23936](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23936.md) | Feb 16, 2023 |
| Linux | node-undici Debian 14 | 5.19.1+dfsg1+~cs20.10.9.5-1 | [DEBIAN-CVE-2023-23936](https://patchblox.com/security/data/fix/linux/debian-cve-2023-23936.md) | Feb 16, 2023 |
| Linux | nodejs RHEL 8 | 1:18.14.2-2.module+el8.7.0+18445+9493b6ea | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs RHEL 9 | 1:16.19.1-1.el9_2 | [RHSA-2023:2655](https://patchblox.com/security/data/fix/linux/rhsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs almalinux 8 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs almalinux 9 | 1:16.19.1-1.el9_2 | [ALSA-2023:2655](https://patchblox.com/security/data/fix/linux/alsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs ol 8 | 1:18.14.2-2.module+el8.7.0+21020+b7aeeb08 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs ol 9 | 1:18.14.2-2.module+el9.2.0+21038+115df6a2 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | nodejs rocky 8 | 1:18.14.2-2.module+el8.7.0+1177+510ae886 | [RLSA-2023:1583](https://patchblox.com/security/data/fix/linux/rlsa-2023-1583.md) | Apr 6, 2023 |
| Linux | nodejs rocky 9 | 1:16.19.1-1.el9_2 | [RLSA-2023:2655](https://patchblox.com/security/data/fix/linux/rlsa-2023-2655.md) | May 25, 2023 |
| Linux | nodejs-devel RHEL 8 | 1:18.14.2-2.module+el8.7.0+18445+9493b6ea | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-devel RHEL 9 | 1:18.14.2-2.module+el9.2.0.z+18497+a402347c | [RHSA-2023:2654](https://patchblox.com/security/data/fix/linux/rhsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-devel almalinux 8 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-devel almalinux 9 | 1:18.14.2-2.module_el9.2.0+29+de583a0b | [ALSA-2023:2654](https://patchblox.com/security/data/fix/linux/alsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-devel ol 8 | 1:18.14.2-2.module+el8.7.0+21020+b7aeeb08 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs-devel ol 9 | 1:18.14.2-2.module+el9.2.0+21038+115df6a2 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | nodejs-docs RHEL 8 | 1:18.14.2-2.module+el8.7.0+18445+9493b6ea | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-docs RHEL 9 | 1:16.19.1-1.el9_2 | [RHSA-2023:2655](https://patchblox.com/security/data/fix/linux/rhsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-docs almalinux 8 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-docs almalinux 9 | 1:16.19.1-1.el9_2 | [ALSA-2023:2655](https://patchblox.com/security/data/fix/linux/alsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-docs ol 8 | 1:18.14.2-2.module+el8.7.0+21020+b7aeeb08 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs-docs ol 9 | 1:18.14.2-2.module+el9.2.0+21038+115df6a2 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | nodejs-full-i18n RHEL 8 | 1:18.14.2-2.module+el8.7.0+18445+9493b6ea | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-full-i18n RHEL 9 | 1:16.19.1-1.el9_2 | [RHSA-2023:2655](https://patchblox.com/security/data/fix/linux/rhsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-full-i18n almalinux 8 | 1:18.14.2-2.module_el8.7.0+3497+c65299e7 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-full-i18n almalinux 9 | 1:16.19.1-1.el9_2 | [ALSA-2023:2655](https://patchblox.com/security/data/fix/linux/alsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-full-i18n ol 8 | 1:18.14.2-2.module+el8.7.0+21020+b7aeeb08 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs-full-i18n ol 9 | 1:18.14.2-2.module+el9.2.0+21038+115df6a2 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | nodejs-libs RHEL 9 | 1:16.19.1-1.el9_2 | [RHSA-2023:2655](https://patchblox.com/security/data/fix/linux/rhsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-libs almalinux 9 | 1:16.19.1-1.el9_2 | [ALSA-2023:2655](https://patchblox.com/security/data/fix/linux/alsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-libs ol 9 | 1:16.19.1-1.el9_2 | [ELSA-2023-2655](https://patchblox.com/security/data/fix/linux/elsa-2023-2655.md) | May 17, 2023 |
| Linux | nodejs-nodemon RHEL 8 | 0:2.0.20-2.module+el8.7.0+18445+9493b6ea | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-nodemon RHEL 9 | 0:2.0.20-3.el9_2 | [RHSA-2023:2655](https://patchblox.com/security/data/fix/linux/rhsa-2023-2655.md) | May 9, 2023 |
| Linux | nodejs-nodemon almalinux 8 | 2.0.20-2.module_el8.7.0+3497+c65299e7 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-nodemon almalinux 9 | 2.0.20-2.module_el9.2.0+29+de583a0b | [ALSA-2023:2654](https://patchblox.com/security/data/fix/linux/alsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-nodemon ol 8 | 0:2.0.20-2.module+el8.7.0+21020+b7aeeb08 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs-nodemon ol 9 | 0:2.0.20-2.module+el9.2.0+21038+115df6a2 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | nodejs-nodemon rocky 8 | 0:2.0.20-2.module+el8.7.0+1108+49363b0d | [RLSA-2023:1583](https://patchblox.com/security/data/fix/linux/rlsa-2023-1583.md) | Apr 6, 2023 |
| Linux | nodejs-nodemon rocky 9 | 0:2.0.20-3.el9_2 | [RLSA-2023:2655](https://patchblox.com/security/data/fix/linux/rlsa-2023-2655.md) | May 25, 2023 |
| Linux | nodejs-packaging RHEL 8 | 0:2021.06-4.module+el8.7.0+15582+19c314fa | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-packaging RHEL 9 | 0:2021.06-4.module+el9.1.0+15718+e52ec601 | [RHSA-2023:2654](https://patchblox.com/security/data/fix/linux/rhsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-packaging almalinux 8 | 2021.06-4.module_el8.7.0+3343+ea2b7901 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-packaging almalinux 9 | 2021.06-4.module_el9.1.0+13+d9a595ea | [ALSA-2023:2654](https://patchblox.com/security/data/fix/linux/alsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-packaging ol 8 | 0:2021.06-4.module+el8.7.0+20766+0a247725 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs-packaging ol 9 | 0:2021.06-4.module+el9.1.0+20762+f52d7401 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | nodejs-packaging rocky 8 | 0:2021.06-4.module+el8.7.0+1072+5b168780 | [RLSA-2023:1583](https://patchblox.com/security/data/fix/linux/rlsa-2023-1583.md) | Apr 6, 2023 |
| Linux | nodejs-packaging rocky 9 | 0:2021.06-4.module+el9.7.0+40025+0e0cf6b2 | [RLSA-2023:2654](https://patchblox.com/security/data/fix/linux/rlsa-2023-2654.md) | Dec 3, 2025 |
| Linux | nodejs-packaging-bundler RHEL 8 | 0:2021.06-4.module+el8.7.0+15582+19c314fa | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-packaging-bundler RHEL 9 | 0:2021.06-4.module+el9.1.0+15718+e52ec601 | [RHSA-2023:2654](https://patchblox.com/security/data/fix/linux/rhsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-packaging-bundler almalinux 8 | 2021.06-4.module_el8.7.0+3343+ea2b7901 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | nodejs-packaging-bundler almalinux 9 | 2021.06-4.module_el9.1.0+13+d9a595ea | [ALSA-2023:2654](https://patchblox.com/security/data/fix/linux/alsa-2023-2654.md) | May 9, 2023 |
| Linux | nodejs-packaging-bundler ol 8 | 0:2021.06-4.module+el8.7.0+20766+0a247725 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | nodejs-packaging-bundler ol 9 | 0:2021.06-4.module+el9.1.0+20762+f52d7401 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |
| Linux | npm RHEL 8 | 1:9.5.0-1.18.14.2.2.module+el8.7.0+18445+9493b6ea | [RHSA-2023:1583](https://patchblox.com/security/data/fix/linux/rhsa-2023-1583.md) | Apr 4, 2023 |
| Linux | npm RHEL 9 | 1:8.19.3-1.16.19.1.1.el9_2 | [RHSA-2023:2655](https://patchblox.com/security/data/fix/linux/rhsa-2023-2655.md) | May 9, 2023 |
| Linux | npm almalinux 8 | 1:9.5.0-1.18.14.2.2.module_el8.7.0+3497+c65299e7 | [ALSA-2023:1583](https://patchblox.com/security/data/fix/linux/alsa-2023-1583.md) | Apr 4, 2023 |
| Linux | npm almalinux 9 | 1:8.19.3-1.16.19.1.1.el9_2 | [ALSA-2023:2655](https://patchblox.com/security/data/fix/linux/alsa-2023-2655.md) | May 9, 2023 |
| Linux | npm ol 8 | 1:9.5.0-1.18.14.2.2.module+el8.7.0+21020+b7aeeb08 | [ELSA-2023-1583](https://patchblox.com/security/data/fix/linux/elsa-2023-1583.md) | Apr 5, 2023 |
| Linux | npm ol 9 | 1:9.5.0-1.18.14.2.2.module+el9.2.0+21038+115df6a2 | [ELSA-2023-2654](https://patchblox.com/security/data/fix/linux/elsa-2023-2654.md) | May 17, 2023 |

---

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