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Fencer Vulns
medium 6.5

CVE-2025-23167 json

A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required `\r\n\r\n`. This i…

published 2025-05-19 17 mo ago modified 2026-06-17 4 mo ago also BIT-node-2025-23167 , BIT-node-min-2025-23167 , EUVD-2025-27706

cvss
6.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

A flaw in Node.js 20's HTTP parser allows improper termination of HTTP/1 headers using `\r\n\rX` instead of the required `\r\n\r\n`. This inconsistency enables request smuggling, allowing attackers to bypass proxy-based access controls and submit unauthorized requests.

The issue was resolved by upgrading `llhttp` to version 9, which enforces correct header termination.

Impact: * This vulnerability affects only Node.js 20.x users prior to the `llhttp` v9 upgrade.

Patch / fix

  • bitnami node 20.19.2
  • bitnami node-min 20.19.2
  • nodejs node.js 20.19.2
  • node-undici Debian 14 7.15.0+dfsg+~cs3.2.0-1

debian advisories DEBIAN-CVE-2025-23167

  • npm RHEL 8 1:10.8.2-1.20.19.2.1.module+el8.10.0+23139+21ba74c5
  • nodejs RHEL 8 1:20.19.2-1.module+el8.10.0+23139+21ba74c5
  • nodejs-nodemon RHEL 8 3.0.1-1.module+el8.10.0+23139+21ba74c5
  • nodejs-full-i18n RHEL 8 1:20.19.2-1.module+el8.10.0+23139+21ba74c5
  • nodejs-packaging RHEL 8 2021.06-4.module+el8.10.0+23139+21ba74c5
  • nodejs-packaging-bundler RHEL 8 2021.06-4.module+el8.10.0+23139+21ba74c5
  • npm RHEL 9 1:10.8.2-1.20.19.2.1.module+el9.6.0+23146+be9976bd
  • nodejs RHEL 9 1:20.19.2-1.module+el9.6.0+23146+be9976bd

red hat advisories RHSA-2025:8514RHSA-2025:8468

  • nodejs16 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 16.20.2-150400.3.42.1
  • nodejs18 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +5 more 18.20.8-150400.9.39.1
  • nodejs20 SLE Module for Web and Scripting 15 SP6, openSUSE Leap 15.6 20.19.2-150600.3.12.1
  • nodejs20 SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 20.19.2-150500.11.21.1
  • nodejs18 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 18.20.8-8.44.1

suse advisories SUSE-SU-2026:4355-1SUSE-SU-2026:4261-1SUSE-SU-2026:4248-1SUSE-SU-2025:02045-1SUSE-SU-2025:02039-1

  • npm AlmaLinux 8 1:10.8.2-1.20.19.2.1.module_el8.10.0+4007+01f7d99b
  • nodejs AlmaLinux 8 1:20.19.2-1.module_el8.10.0+4007+01f7d99b
  • nodejs-nodemon AlmaLinux 8 3.0.1-1.module_el8.10.0+3982+85c136aa
  • nodejs-full-i18n AlmaLinux 8 1:20.19.2-1.module_el8.10.0+4007+01f7d99b
  • nodejs-packaging AlmaLinux 8 2021.06-4.module_el8.10.0+3987+dbda4426
  • nodejs-packaging-bundler AlmaLinux 8 2021.06-4.module_el8.10.0+3958+472a6467

almalinux advisories ALSA-2025:8514

  • nodejs Rocky Linux 9 1:20.19.2-1.module+el9.6.0+32143+ae966e5b
  • nodejs-nodemon Rocky Linux 9 3.0.1-1.module+el9.5.0+31770+0da7192d
  • nodejs-nodemon Rocky Linux 9 3.0.1-1.module+el9.6.0+32322+a8b1fd01
  • nodejs-nodemon Rocky Linux 9 3.0.1-1.module+el9.6.0+32045+2e5d342d
  • nodejs-nodemon Rocky Linux 9 3.0.1-1.module+el9.6.0+32143+ae966e5b
  • nodejs-nodemon Rocky Linux 9 3.0.1-1.module+el9.6.0+32144+1d29a396
  • nodejs-nodemon Rocky Linux 9 3.0.1-1.module+el9.6.0+32185+bd121a25
  • nodejs-packaging Rocky Linux 9 2021.06-4.module+el9.5.0+31770+0da7192d

rocky linux advisories RLSA-2025:8468RLSA-2025:8514

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-2025-23167 updated cvss 6.5

nodejs: Improper HTTP Header Termination in Node.js 20 Enables Request Smuggling

  • Red Hat Enterprise Linux AppStream (v. 8) nodejs 20.19.2-1.module+el8.10.0+23139+21ba74c5, nodejs-nodemon 3.0.1-1.module+el8.10.0+23139+21ba74c5, npm 10.8.2-1.20.19.2.1.module+el8.10.0+23139+21ba74c5, nodejs-full-i18n 20.19.2-1.module+el8.10.0+23139+21ba74c5, nodejs-packaging 2021.06-4.module+el8.10.0+23139+21ba74c5, nodejs-packaging-bundler 2021.06-4.module+el8.10.0+23139+21ba74c5
    fixed: vendor fix RHSA-2025:8514
  • Red Hat Enterprise Linux AppStream (v. 9) nodejs 20.19.2-1.module+el9.6.0+23146+be9976bd, nodejs-nodemon 3.0.1-1.module+el9.6.0+23146+be9976bd, npm 10.8.2-1.20.19.2.1.module+el9.6.0+23146+be9976bd, nodejs-full-i18n 20.19.2-1.module+el9.6.0+23146+be9976bd, nodejs-packaging 2021.06-4.module+el9.6.0+23146+be9976bd, nodejs-packaging-bundler 2021.06-4.module+el9.6.0+23146+be9976bd
    fixed: vendor fix RHSA-2025:8468
  • Red Hat Enterprise Linux 8 npm, nodejs, nodejs-libs, nodejs-nodemon, nodejs-full-i18n, nodejs-packaging, +1 more Red Hat Enterprise Linux 9 npm, nodejs, nodejs-libs, nodejs-full-i18n Red Hat Enterprise Linux 10 nodejs22
    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
none
Automatable
yes
Technical impact
partial
Assessed
17 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami node
<20.19.2
20.19.2
bitnami node-min
<20.19.2
20.19.2

Affected products

  • nodejs node

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.