CVE-2022-35256

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-12-05 · updated 2026-06-17
Weakness: CWE-444

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.

Affected products

Debian Linux: 11.0
Llhttp: before 6.0.10 — fixed in 6.0.10
Node.js: from 14.0.0 through 14.14.0; from 14.15.0 before 14.20.1; from 16.0.0 through 16.12.0; from 16.13.0 before 16.17.1; from 18.0.0 before 18.9.1 — fixed in 14.20.1, 16.17.1, 18.9.1
Siemens SINEC INS: before 1.0; 1.0, 1.0-sp1, 1.0-sp2 — fixed in 1.0

How to fix

Upgrade to a fixed version: Llhttp 6.0.10; Node.js 14.20.1, 16.17.1, 18.9.1; Siemens SINEC INS 1.0. Check the vendor advisory for mitigations.

References

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