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Vulnerabilities

Vulnerability · CVE-2025-23167

A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using instead of the required .

Published May 19, 2025 · catalog updated May 27, 2025 · Node

Check if you run it

No confirmed exploitation is on record for CVE-2025-23167. EPSS is 0.51%. Act only if a listed version of Node is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.51%
Remediation
Version ranges on file
Affected products
vendor nodejs Node 10.0 <10.*

A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using instead of the required . This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. The issue was resolved by upgrading to version 9, which enforces correct header termination. Impact: * This vulnerability affects only Node.js 20.x users prior to the v9 upgrade.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor nodejs Node 10.0 <10.*10.0 <10.*

How to fix CVE-2025-23167

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-23167. EPSS is 0.51%. Act only if a listed version of Node is installed.

Which versions are affected?

Compare what you have installed with nodejs Node 10.0 <10.* 10.0 <10.*. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.51%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 27, 2025 · EUVD

    Updated

    A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using instead of the required . This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. The issue was resolved by upgrading to version 9, which enforces correct header termination. Impact: * This vulnerability affects only Node.js 20.x us

  2. Oct 17, 2026 · Arch Linux Security

    Detected

    CVE-2025-23167 is named on the public Arch Linux Security page.

Sources

  • Arch Linux SecurityVendor advisoryCVE-2025-23167

    CVE-2025-23167 is named on the public Arch Linux Security page.

    security.archlinux.org
  • CVE.orgVulnerability recordCVE-2025-23167

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-23167

    30-day exploitation probability 0.5%

    first.org
  • EUVDVulnerability recordEUVD-2025-27706

    A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using instead of the required . This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests. The issue was resolved by upgr

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.