Description
A flaw in Node.js HTTP client can cause a request desynchronization for Node.js-based forwarding proxies that rebuild outbound headers from the visible `IncomingMessage` headers while piping the original body to a reused backend connection.

Node.js can omit headers beyond `maxHeadersCount` / `maxHeaderPairs` from `req.headers`, `req.rawHeaders`, and `req.headersDistinct`, while still using those omitted headers internally for HTTP message framing. In particular, `Content-Length` can be hidden from userland while the request body is still delivered.

This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.
Published: 2026-09-01
Score: 3.7 Low
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
Link Providers
https://hackerone.com/reports/3564941 cve-icon cve-icon
History

Tue, 01 Sep 2026 04:15:00 +0000

Type Values Removed Values Added
Title Request Desynchronization in Node.js HTTP Client

Tue, 01 Sep 2026 02:45:00 +0000

Type Values Removed Values Added
Description A flaw in Node.js HTTP client can cause a request desynchronization for Node.js-based forwarding proxies that rebuild outbound headers from the visible `IncomingMessage` headers while piping the original body to a reused backend connection. Node.js can omit headers beyond `maxHeadersCount` / `maxHeaderPairs` from `req.headers`, `req.rawHeaders`, and `req.headersDistinct`, while still using those omitted headers internally for HTTP message framing. In particular, `Content-Length` can be hidden from userland while the request body is still delivered. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.
Weaknesses CWE-444
References
Metrics cvssV3_0

{'score': 3.7, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-09-01T02:08:29.536Z

Reserved: 2026-05-26T15:00:06.427Z

Link: CVE-2026-48932

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T03:16:48.680

Modified: 2026-09-01T03:16:48.680

Link: CVE-2026-48932

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-01T04:00:13Z

Weaknesses
  • CWE-444

    Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')