CVE-2025-23167

EUVD-2025-27706

19.05.2025, 02:15

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.

HTTP Request/Response Smuggling

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	6.5 MEDIUM	NETWORK	LOW	NONE	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: 37%

Debian Releases

Debian Product

Codename

llhttp

forky	9.4.2+~cs12.11.9-5 fixed
sid	9.4.2+~cs12.11.9-5 fixed

node-undici

bookworm	no-dsa
bookworm (security)	vulnerable
forky	8.5.0+dfsg+~cs3.2.0-3 fixed
sid	8.5.0+dfsg+~cs3.2.0-3 fixed
trixie	no-dsa

openSUSE / SLES Releases

openSUSE Product

Release

nodejs20

suse enterprise sap 15 SP6	20.19.2-150600.3.12.1 fixed
suse enterprise server 15 SP5	20.19.2-150500.11.21.1 fixed
suse enterprise server 15 SP6	20.19.2-150600.3.12.1 fixed

nodejs20-devel

suse enterprise sap 15 SP6	20.19.2-150600.3.12.1 fixed
suse enterprise server 15 SP5	20.19.2-150500.11.21.1 fixed
suse enterprise server 15 SP6	20.19.2-150600.3.12.1 fixed

nodejs20-docs

suse enterprise sap 15 SP6	20.19.2-150600.3.12.1 fixed
suse enterprise server 15 SP5	20.19.2-150500.11.21.1 fixed
suse enterprise server 15 SP6	20.19.2-150600.3.12.1 fixed

npm20

suse enterprise sap 15 SP6	20.19.2-150600.3.12.1 fixed
suse enterprise server 15 SP5	20.19.2-150500.11.21.1 fixed
suse enterprise server 15 SP6	20.19.2-150600.3.12.1 fixed

Amazon Linux Releases

Amazon Package

Release

nodejs20

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-debuginfo

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-debugsource

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-devel

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-docs

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-full-i18n

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-libs

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-libs-debuginfo

Amazon Linux 2023

1:20.19.2-1.amzn2023.0.1

fixed

nodejs20-npm

Amazon Linux 2023

1:10.8.2-1.20.19.2.1.amzn2023.0.1

fixed

v8-11.3-devel

Amazon Linux 2023

3:11.3.244.8-1.20.19.2.1.amzn2023.0.1

fixed

Common Weakness Enumeration

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References

https://nodejs.org/en/blog/vulnerability/may-2025-security-releases