CVE-2022-35256

Name: CVE-2022-35256
Creator: NVD / NIST
Published: 2022-12-05T22:15:10.57+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.59%

Last modified Jun 17, 2026

CVE-2022-35256 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The llhttp parser in the http module in Node v18.7.0 does not correctly handle header fields that are not terminated with CLRF. This may result in HTTP Request Smuggling.. EPSS estimates a 2.59% chance of exploitation in the next 30 days.

Description

The llhttp parser in the http module in Node v18.7.0 does not correctly handle header fields that are not terminated with CLRF. This may result in HTTP Request Smuggling.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

2.59%

83.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nodejs	Node.Js	>= 14.0.0, <= 14.14.0
Nodejs	Node.Js	>= 14.15.0, < 14.20.1
Nodejs	Node.Js	>= 16.0.0, <= 16.12.0
Nodejs	Node.Js	>= 16.13.0, < 16.17.1
Nodejs	Node.Js	>= 18.0.0, < 18.9.1
Llhttp	Llhttp	< 6.0.10
Siemens	Sinec Ins	< 1.0
Siemens	Sinec Ins	1.0
Debian	Debian Linux	11.0

References

https://cert-portal.siemens.com/productcert/pdf/ssa-332410.pdfThird Party Advisory
https://hackerone.com/reports/1675191Exploit, Issue Tracking, Third Party Advisory
https://www.debian.org/security/2023/dsa-5326Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-332410.pdfThird Party Advisory
https://hackerone.com/reports/1675191Exploit, Issue Tracking, Third Party Advisory
https://www.debian.org/security/2023/dsa-5326Third Party Advisory

Timeline

Published: Dec 5, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-35256?

The llhttp parser in the http module in Node v18.7.0 does not correctly handle header fields that are not terminated with CLRF. This may result in HTTP Request Smuggling.

How severe is CVE-2022-35256?

CVE-2022-35256 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.59% probability of exploitation in the next 30 days.

How do I fix CVE-2022-35256?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-35256?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST