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Fencer Vulns
medium 6.5

CVE-2023-23936 json

CRLF Injection in Nodejs ‘undici’ via host

published 2023-02-16 3 y ago modified 2026-09-10 1 mo ago also BIT-node-2023-23936 , BIT-node-min-2023-23936 , EUVD-2023-0633 , GHSA-5r9g-qh6m-jxff

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm undici 5.19.1
  • bitnami node 16.19.1, 18.14.1, 19.6.1
  • bitnami node-min 16.19.1, 18.14.1, 19.6.1
  • nodejs node.js 16.19.1, 18.14.1, 19.6.1
  • nodejs undici 5.19.1
  • node-undici Debian 12 5.15.0+dfsg1+~cs20.10.9.3-1+deb12u1
  • node-undici Debian 14, Debian 13 5.19.1+dfsg1+~cs20.10.9.5-1

debian advisories DEBIAN-CVE-2023-23936

  • npm RHEL 9 1:9.5.0-1.18.14.2.2.module+el9.2.0.z+18497+a402347c
  • nodejs RHEL 9 1:18.14.2-2.module+el9.2.0.z+18497+a402347c
  • nodejs-nodemon RHEL 9 2.0.20-2.module+el9.2.0.z+18497+a402347c
  • nodejs-full-i18n RHEL 9 1:18.14.2-2.module+el9.2.0.z+18497+a402347c
  • nodejs-packaging RHEL 9 2021.06-4.module+el9.1.0+15718+e52ec601
  • nodejs-packaging-bundler RHEL 9 2021.06-4.module+el9.1.0+15718+e52ec601
  • npm RHEL 8 1:9.5.0-1.18.14.2.2.module+el8.7.0+18445+9493b6ea
  • nodejs RHEL 8 1:18.14.2-2.module+el8.7.0+18445+9493b6ea

red hat advisories RHSA-2023:2654RHSA-2023:1583RHSA-2023:1582RHSA-2023:5533RHSA-2023:2655

  • nodejs18 SLE Module for Web and Scripting 15 SP4, openSUSE Leap 15.4 18.14.2-150400.9.6.2
  • nodejs18 SLE Module for Web and Scripting 12 18.14.2-8.6.2
  • nodejs16 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE High Performance Computing 15 SP3-LTSS +3 more 16.19.1-150300.7.18.1
  • nodejs16 SLE Module for Web and Scripting 12 16.19.1-8.24.1
  • nodejs16 SLE Module for Web and Scripting 15 SP4, openSUSE Leap 15.4 16.19.1-150400.3.15.1

suse advisories SUSE-SU-2023:0738-1SUSE-SU-2023:0715-1SUSE-SU-2023:0673-1SUSE-SU-2023:0609-1SUSE-SU-2023:0608-1

  • npm AlmaLinux 9 1:9.5.0-1.18.14.2.2.module_el9.2.0+29+de583a0b
  • nodejs AlmaLinux 9 1:18.14.2-2.module_el9.2.0+29+de583a0b
  • nodejs-nodemon AlmaLinux 9 2.0.20-2.module_el9.2.0+29+de583a0b
  • nodejs-full-i18n AlmaLinux 9 1:18.14.2-2.module_el9.2.0+29+de583a0b
  • nodejs-packaging AlmaLinux 9 2021.06-4.module_el9.1.0+13+d9a595ea
  • nodejs-packaging-bundler AlmaLinux 9 2021.06-4.module_el9.1.0+13+d9a595ea
  • nodejs AlmaLinux 9 1:16.19.1-1.el9_2
  • npm AlmaLinux 9 1:8.19.3-1.16.19.1.1.el9_2

almalinux advisories ALSA-2023:2654ALSA-2023:2655ALSA-2023:1582ALSA-2023:1583

  • nodejs-packaging Rocky Linux 9 2021.06-4.module+el9.7.0+40025+0e0cf6b2
  • nodejs-packaging Rocky Linux 9 2021.06-4.module+el9.7.0+40017+f0db1785
  • nodejs-packaging Rocky Linux 9 2021.06-4.module+el9.7.0+40018+a011993d
  • nodejs-packaging Rocky Linux 9 2021.06-4.module+el9.7.0+40022+9ecc286c
  • nodejs Rocky Linux 9 1:16.19.1-1.el9_2
  • nodejs-nodemon Rocky Linux 9 2.0.20-3.el9_2
  • nodejs Rocky Linux 8 1:16.19.1-1.module+el8.7.0+1178+d52dba78
  • nodejs-nodemon Rocky Linux 8 2.0.20-3.module+el8.7.0+1178+d52dba78

rocky linux advisories RLSA-2023:2654RLSA-2023:2655RLSA-2023:1582RLSA-2023:1583

  • nodejs Alpine 3.16, Alpine 3.15 16.19.1-r0
  • nodejs Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 18.14.1-r0

alpine advisories ALPINE-CVE-2023-23936

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nodejs CBL-Mariner 2.0 16.19.1-1

azure linux advisories AZL-13604

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-23936 updated cvss 6.5

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

  • Red Hat 3scale API Management Platform 2 3scale-amp2/system-rhel7
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 16.19.1-1.module+el8.7.0+18373+704f5cef, nodejs 18.14.2-2.module+el8.7.0+18445+9493b6ea, nodejs-packaging 25-1.module+el8.5.0+10992+fac5fe06, npm 9.5.0-1.18.14.2.2.module+el8.7.0+18445+9493b6ea, npm 8.19.3-1.16.19.1.1.module+el8.7.0+18373+704f5cef, nodejs-nodemon 2.0.20-2.module+el8.7.0+18445+9493b6ea, +5 more
    fixed: vendor fix RHSA-2023:1582
  • Red Hat Enterprise Linux AppStream (v. 9) nodejs 16.19.1-1.el9_2, nodejs-libs 16.19.1-1.el9_2, npm 8.19.3-1.16.19.1.1.el9_2, nodejs-full-i18n 16.19.1-1.el9_2, nodejs 18.14.2-2.module+el9.2.0.z+18497+a402347c, npm 9.5.0-1.18.14.2.2.module+el9.2.0.z+18497+a402347c, +4 more
    fixed: vendor fix RHSA-2023:2655
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) nodejs 16.20.2-1.el9_0, nodejs-libs 16.20.2-1.el9_0, npm 8.19.4-1.16.20.2.1.el9_0, nodejs-full-i18n 16.20.2-1.el9_0
    fixed: vendor fix RHSA-2023:5533
  • Red Hat Enterprise Linux 8 npm, nodejs, nodejs-libs, nodejs-nodemon, nodejs-full-i18n, nodejs-packaging, +1 more Red Hat Enterprise Linux AppStream (v. 9) nodejs-nodemon 2.0.20-3.el9_2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

1.13% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/1820955 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
GitHub 3.1 4.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm undici
>=2.0.0, <5.19.1
5.19.1
bitnami node
>=16.0.0, <16.19.1
>=18.0.0, <18.14.1
>=19.0.0, <19.6.1
16.19.1
18.14.1
19.6.1
bitnami node-min
>=16.0.0, <16.19.1
>=18.0.0, <18.14.1
>=19.0.0, <19.6.1
16.19.1
18.14.1
19.6.1

Affected products

  • nodejs undici

Classification

Weakness
  • CWE-93 Improper Neutralization of CRLF Sequences
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.