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MEDIUM

CVE-2023-23936

CVSS v3

5.4

MEDIUM

EPSS Score

1.1 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • nodeBitnamifrom 16.0.0 · fixed in 16.19.1and 1 other package
  • undicinpmfrom 2.0.0 · fixed in 5.19.1
  • nodejsAlmaLinux:9all versions · fixed in 1:16.19.1-1.el9_2and 3 other packages
  • nodejsAlmaLinux:8all versions · fixed in 1:18.14.2-2.module_el8.7.0+3497+c65299e7and 3 other packages
  • nodejs-develAlmaLinux:9all versions · fixed in 1:18.14.2-2.module_el9.2.0+29+de583a0b
  • nodejs-nodemonAlmaLinux:9all versions · fixed in 2.0.20-2.module_el9.2.0+29+de583a0b
  • nodejs-nodemonAlmaLinux:8all versions · fixed in 2.0.20-2.module_el8.7.0+3497+c65299e7
  • nodejs-packagingAlmaLinux:9all versions · fixed in 2021.06-4.module_el9.1.0+13+d9a595eaand 1 other package

3 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-23936 Red Hat Product Security160 products fixed · 1 known affected

    Node.js: Fetch API did not protect against CRLF injection in host headers

    3scale-amp-system-container as a component of Red Hat 3scale API Management Platform 2

  • RHSA-2023:5533 Red Hat Product Security34 products fixed

    Red Hat Security Advisory: nodejs security, bug fix, and enhancement update

  • RHSA-2023:2655 Red Hat Product Security34 products fixed

    Red Hat Security Advisory: nodejs and nodejs-nodemon security, bug fix, and enhancement update

  • RHSA-2023:2654 Red Hat Product Security31 products fixed

    Red Hat Security Advisory: nodejs:18 security, bug fix, and enhancement update

  • RHSA-2023:1583 Red Hat Product Security31 products fixed

    Red Hat Security Advisory: nodejs:18 security, bug fix, and enhancement update

  • RHSA-2023:1582 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: nodejs:16 security, bug fix, and enhancement update

Full record on 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.

Technical details

Published
2023-02-16

Frequently asked questions

What is CVE-2023-23936?

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.

Is CVE-2023-23936 actively exploited?

Active exploitation of CVE-2023-23936 has not been confirmed. Its EPSS score was 1.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-23936?

CVE-2023-23936 has a CVSS v3 base score of 5.4 (MEDIUM severity).

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