CVE-2023-23936

CRLF Injection in Nodejs ‘undici’ via host

MEDIUM

5.4

CVSS Score

Published: February 16, 2023 at 05:30 PM UTC

Updated: June 17, 2026 at 05:38 AM UTC

2 products affected across 1 vendorNode.jsUndici

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Severity

MEDIUM5.4

Exploit prediction

EPSS 1%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Node.js · Node.js

95%

16.0.0 ≤ v < 16.19.118.0.0 ≤ v < 18.14.119.0.0 ≤ v < 19.6.1

Affected range stops below 16.19.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 18.14.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 19.6.1, so it looks safe — our inference, not a vendor statement

Undici · Node.jsnpm

95%

v < 5.19.12.0.0 ≤ v < 5.19.1

Affected range stops below 5.19.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCPatch

Source: [email protected]

https://github.com/nodejs/undici/commit/a2eff05401358f6595138df963837c24348f2034

x_refsource_MISCRelease Notes

Source: [email protected]

https://github.com/nodejs/undici/releases/tag/v5.19.1

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://github.com/nodejs/undici/security/advisories/GHSA-5r9g-qh6m-jxff

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

https://hackerone.com/reports/1820955

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-93CWE-74

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