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TI-2023-10307 Aliases CVE-2023-24807GHSA-r6ch-mqf9-qc9w

Undici vulnerable to Regular Expression Denial of Service in Headers

Priority MEDIUM 42CWE-20Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
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. Impact type from CWE-1333.

Summary

Undici is an HTTP/1.1 client for Node.js. Prior to version 5.19.1, the `Headers.set()` and `Headers.append()` methods are vulnerable to Regular Expression Denial of Service (ReDoS) attacks when untrusted values are passed into the functions. This is due to the inefficient regular expression used to normalize the values in the `headerValueNormalize()` utility function. This vulnerability was patched in v5.19.1. No known workarounds are available.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01315 70th percentileScored 2026-11-07
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
None
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
NodeJSundicibefore 5.19.15.19.1Patch availableCNA
—undici (npm)before 5.19.15.19.1Patch availableGHSA-r6ch-mqf9-qc9w
  • undici VendorNodeJS Affected before 5.19.1 Fixed in 5.19.1 Patch available CNA
  • undici (npm) Vendor— Affected before 5.19.1 Fixed in 5.19.1 Patch available GHSA-r6ch-mqf9-qc9w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*before 5.19.1VulnerableNodeJS
  • cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* Versions before 5.19.1 Vulnerable ·NodeJS

Remediation

  • Fix · CNA undici (nodejs) Fixed in 5.19.1
  • Fix · GHSA-r6ch-mqf9-qc9w 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: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat 3scale API Management Platform 2AffectedNo fix yet: Fix deferred
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-2023-24807
  2. 2026-10-03 Alias added: GHSA-r6ch-mqf9-qc9w

References

Patch 1

Advisory 3

Other 2

  • TI-2026-01215 undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') CVSS 3.1CRITICAL 9.8
  • TI-2022-16376 `undici.request` vulnerable to SSRF using absolute URL on `pathname` CVSS 3.1CRITICAL 9.8
  • TI-2023-09734 CRLF Injection in Nodejs ‘undici’ via host CVSS 3.1MEDIUM 6.5
  • TI-2022-13193 CRLF injection in request headers CVSS 3.1MEDIUM 6.5
  • TI-2022-16375 CRLF Injection in Nodejs ‘undici’ via Content-Type CVSS 3.1MEDIUM 5.3
  • TI-2022-13194 Uncleared cookies on cross-host/cross-origin redirect in undici CVSS 3.1MEDIUM 6.5
See all 51 →

Sources

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