CRLF Injection in Nodejs ‘undici’ via host

MÉDIO 5.4CVE-2023-23936 · BIT-node-2023-23936 · BIT-node-min-2023-23936 · Published 16/02/2023 · updated 17/06/2026

Em resumo

CVE-2023-23936 é uma vulnerabilidade MÉDIO (CVSS 5.4) que afeta node.js (nodejs), undici (nodejs), undici.
Chance de exploração nos próximos 30 dias (EPSS): 1.1%, maior que 66.4% das vulnerabilidades.
Correção: atualize para 16.19.1, 18.14.1, 19.6.1, 5.19.1 ou posterior.

Package	Affected versions	Patched versions
node.js nodejs	`≥ 16.0.0, < 16.19.1≥ 18.0.0, < 18.14.1≥ 19.0.0, < 19.6.1`	`16.19.118.14.119.6.1`
undici nodejs	`≥ 2.0.0, < 5.19.1`	`5.19.1`
undici npm	`≥ 2.0.0, < 5.19.1`	`5.19.1`

Description

Impact

undici library does not protect host HTTP header from CRLF injection vulnerabilities.

Patches

This issue was patched in Undici v5.19.1.

Workarounds

Sanitize the headers.host string before passing to undici.

References

Reported at https://hackerone.com/reports/1820955.

Credits

Thank you to Zhipeng Zhang (@timon8) for reporting this vulnerability.

NVD 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.