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TI-2023-09734 Aliases CVE-2023-23936GHSA-5r9g-qh6m-jxff

CRLF Injection in Nodejs ‘undici’ via host

Priority HIGH 68CWE-93Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 3 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01129 66th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial undici (nodejs): 5.19.1undici (npm): 5.19.1Red Hat: 5 advisoriesRed Hat: 3 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NodeJSundici2.0.0 to before 5.19.15.19.1Patch availableCNA
—undici (npm)2.0.0 to before 5.19.15.19.1Patch availableGHSA-5r9g-qh6m-jxff
  • undici VendorNodeJS Affected 2.0.0 to before 5.19.1 Fixed in 5.19.1 Patch available CNA
  • undici (npm) Vendor— Affected 2.0.0 to before 5.19.1 Fixed in 5.19.1 Patch available GHSA-5r9g-qh6m-jxff

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*16.0.0 to before 16.19.1; 18.0.0 to before 18.14.1VulnerableNodeJS
cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*19.0.0 to before 19.6.1VulnerableNodeJS
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*2.0.0 to before 5.19.1VulnerableNodeJS
  • cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:* Versions 16.0.0 to before 16.19.1; 18.0.0 to before 18.14.1 Vulnerable ·NodeJS
  • cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:* Versions 19.0.0 to before 19.6.1 Vulnerable ·NodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions 2.0.0 to before 5.19.1 Vulnerable ·NodeJS

Remediation

  • Fix · CNA undici (nodejs) Fixed in 5.19.1
  • Fix · GHSA-5r9g-qh6m-jxff undici (npm) Fixed in 5.19.1 Advisory →

Red Hat 5 advisories

  • RHSA-2023:5533 Released 2023-10-09 · Red Hat rating Important
    nodejs security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) nodejs-1:16.20.2-1.el9_0, nodejs-docs-1:16.20.2-1.el9_0, nodejs-full-i18n-1:16.20.2-1.el9_0 +2
  • RHSA-2023:2655 Released 2023-05-09 · Red Hat rating Moderate
    nodejs and nodejs-nodemon security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) nodejs-1:16.19.1-1.el9_2, nodejs-docs-1:16.19.1-1.el9_2, nodejs-full-i18n-1:16.19.1-1.el9_2 +3
  • RHSA-2023:2654 Released 2023-05-09 · Red Hat rating Moderate
    nodejs:18 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) nodejs-1:18.14.2-2.module+el9.2.0.z+18497+a402347c.aarch64::nodejs:18, nodejs-1:18.14.2-2.module+el9.2.0.z+18497+a402347c.ppc64le::nodejs:18, nodejs-1:18.14.2-2.module+el9.2.0.z+18497+a402347c.s390x::nodejs:18 +20
Show 2 more Red Hat advisories
  • RHSA-2023:1583 Released 2023-04-04 · Red Hat rating Moderate
    nodejs:18 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) nodejs-1:18.14.2-2.module+el8.7.0+18445+9493b6ea.aarch64::nodejs:18, nodejs-1:18.14.2-2.module+el8.7.0+18445+9493b6ea.ppc64le::nodejs:18, nodejs-1:18.14.2-2.module+el8.7.0+18445+9493b6ea.s390x::nodejs:18 +20
  • RHSA-2023:1582 Released 2023-04-04 · Red Hat rating Moderate
    nodejs:16 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) nodejs-1:16.19.1-1.module+el8.7.0+18373+704f5cef.aarch64::nodejs:16, nodejs-1:16.19.1-1.module+el8.7.0+18373+704f5cef.ppc64le::nodejs:16, nodejs-1:16.19.1-1.module+el8.7.0+18373+704f5cef.s390x::nodejs:16 +19

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat 3scale API Management Platform 2AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:1582, RHSA-2023:1583
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:2654, RHSA-2023:2655
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:5533
Not affected: 2 products
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux AppStream (v. 9)

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-23936
  2. 2026-10-03 Alias added: GHSA-5r9g-qh6m-jxff

References

Exploit 1

Patch 1

Advisory 2

Other 2

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2016-01993 The DES and Triple DES ciphers, as used in the TLS, SSH, and IPSec protocols and other… CVSS 3.1HIGH 7.5
  • TI-2024-03325 Command injection vulnerability in programing languages on Microsoft Windows operating system. CVSS 3.1CRITICAL 9.8
  • TI-2022-03472 X.509 Email Address Variable Length Buffer Overflow CVSS 3.1HIGH 7.5
  • TI-2022-03315 X.509 Email Address 4-byte Buffer Overflow CVSS 3.1HIGH 7.5
See all 186 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences