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Vulnerability record · CVE-2022-32214 · published 14 July 2022

CVE-2022-32214: Node.js llhttp parser accepts non-CRLF delimiters, enabling HTTP request smuggling

LLlhttp · Llhttp

The llhttp parser in Node.js versions before 14.20.1, 16.17.1 and 18.9.1 does not strictly require the CRLF sequence to delimit HTTP requests. This leniency allows crafted requests to be interpreted differently by front-end and back-end HTTP components, causing HTTP request smuggling. Because Node.js is widely used as an application server and proxy, this can undermine request routing and access controls.

6.5 CVSS 3.1 Medium EPSS 82% · top 0.3% CWE-444 · HTTP request smuggling
6.5CVSS 3.1 base score
82%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The llhttp parser <v14.20.1, <v16.17.1 and <v18.9.1 in the http module in Node.js does not strictly use the CRLF sequence to delimit HTTP requests. This can lead to HTTP Request Smuggling (HRS).

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

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 18 September 2026. Confidence: high.

high priorityAlthough CVSS is medium and there is no KEV listing, the very high EPSS score and public exploit reference make this a realistic target for request smuggling attacks against Node.js deployments.

What it is

The llhttp parser in Node.js versions before 14.20.1, 16.17.1 and 18.9.1 does not strictly require the CRLF sequence to delimit HTTP requests. This leniency allows crafted requests to be interpreted differently by front-end and back-end HTTP components, causing HTTP request smuggling. Because Node.js is widely used as an application server and proxy, this can undermine request routing and access controls.

Impact

An attacker can smuggle a second request past front-end controls, potentially poisoning other users' requests, bypassing access controls, or reaching internal endpoints. The CVSS vector limits impact to low confidentiality and integrity with no availability effect.

Attack surface

Reachable over the network via HTTP requests to a Node.js service or a proxy chain that includes Node.js; no authentication or user interaction is required per the CVSS vector (AV:N/AC:L/PR:N/UI:N).

Exploitation

No CISA KEV listing and no ransomware association; EPSS is very high (0.82456, 99.6th percentile) and a HackerOne report is tagged Exploit, indicating public proof-of-concept material exists.

What to do

  • Upgrade Node.js to 14.20.1, 16.17.1, 18.9.1 or later, or apply the vendor patch referenced in the July 2022 Node.js security release.
  • Apply the Debian DSA-5326 update where Node.js is installed from Debian packages.
  • Normalize and reject ambiguous HTTP framing at the front-end proxy (strict CRLF, reject conflicting Content-Length and Transfer-Encoding).
  • Ensure front-end and back-end HTTP parsers agree on request boundaries; avoid mixing parsers with different leniency.
  • Monitor vendor advisories for llhttp and Stormshield Management Center updates if those products are in use.

Detection

  • Inspect HTTP traffic for requests containing bare LF, CR, or other non-CRLF delimiters in header or request-line positions.
  • Alert on requests with both Content-Length and Transfer-Encoding headers, or with duplicated/obfuscated framing headers.
  • Correlate front-end proxy logs with back-end Node.js request logs for mismatched request counts or paths.
  • Hunt for anomalous sequences of pipelined requests from a single source that result in unexpected back-end endpoints being reached.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://hackerone.com/reports/1524692 ExploitIssue TrackingThird Party Advisory
https://nodejs.org/en/blog/vulnerability/july-2022-security-releases/ PatchVendor Advisory
https://www.debian.org/security/2023/dsa-5326 Third Party Advisory
https://hackerone.com/reports/1524692 ExploitIssue TrackingThird Party Advisory
https://nodejs.org/en/blog/vulnerability/july-2022-security-releases/ PatchVendor Advisory
https://www.debian.org/security/2023/dsa-5326 Third Party Advisory

Track CVE-2022-32214 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2022-32214), CISA KEV, FIRST EPSS (scores of 2026-09-24). This page is refreshed as NVD updates the record.