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

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

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