CVE-2023-23936

CRLF Injection in Nodejs ‘undici’ via host

Severity Score

5.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

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.

A flaw was found in the fetch API in Node.js that did not prevent CRLF injection in the 'host' header. This issue could allow HTTP response splitting and HTTP header injection.

Node.js is a software development platform for building fast and scalable network applications in the JavaScript programming language. The package has been upgraded to a later upstream version: nodejs. Issues addressed include HTTP request smuggling, buffer overflow, bypass, crlf injection, and denial of service vulnerabilities.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

Poc

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2023-01-19 CVE Reserved
2023-02-16 CVE Published
2025-03-10 CVE Updated
2025-03-10 First Exploit
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

CAPEC

References (6)

URL	Tag	Source
https://github.com/nodejs/undici/releases/tag/v5.19.1	Release Notes

URL	Date	SRC
https://hackerone.com/reports/1820955	2025-03-10

URL	Date	SRC
https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034	2023-02-24

URL	Date	SRC
https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxff	2023-02-24
https://access.redhat.com/security/cve/CVE-2023-23936	2023-10-09
https://bugzilla.redhat.com/show_bug.cgi?id=2172190	2023-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 16.0.0 < 16.19.1 Search vendor "Nodejs" for product "Node.js" and version " >= 16.0.0 < 16.19.1"		lts		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 18.0.0 < 18.14.1 Search vendor "Nodejs" for product "Node.js" and version " >= 18.0.0 < 18.14.1"		lts		Affected
Nodejs Search vendor "Nodejs"		Node.js Search vendor "Nodejs" for product "Node.js"				>= 19.0.0 < 19.6.1 Search vendor "Nodejs" for product "Node.js" and version " >= 19.0.0 < 19.6.1"		-		Affected
Nodejs Search vendor "Nodejs"		Undici Search vendor "Nodejs" for product "Undici"				>= 2.0.0 < 5.19.1 Search vendor "Nodejs" for product "Undici" and version " >= 2.0.0 < 5.19.1"		node.js		Affected