CVE-2026-48932Network attack vector

Request smuggling via silently truncated framing headers

Published Sep 1, 2026 · Updated Sep 1, 2026

HTTP request smuggling in Node.js 22, Node.js 24, and Node.js 26 allows remote attackers to desynchronize forwarding proxies. The HTTP parser omits headers beyond maxHeadersCount or maxHeaderPairs from IncomingMessage views while still using a hidden Content-Length to frame the delivered body. Exploitation requires a proxy that rebuilds outbound headers from those views, pipes the original body, and reuses a backend connection, allowing request boundaries to be altered.

CVSS severity3.7
Low
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

HTTP request smuggling in Node.js 22, Node.js 24, and Node.js 26 allows remote attackers to desynchronize forwarding proxies. The HTTP parser omits headers beyond maxHeadersCount or maxHeaderPairs from IncomingMessage views while still using a hidden Content-Length to frame the delivered body. Exploitation requires a proxy that rebuilds outbound headers from those views, pipes the original body, and reuses a backend connection, allowing request boundaries to be altered.

The record

CVE
CVE-2026-48932
Published
Sep 1, 2026
Updated
Sep 1, 2026
Vendor
Node.js
Product
Node.js
Classifications
CWE-444, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22.22.3 <=22.22.3
  2. Affected versionversion=24.16.0 <=24.16.0
  3. Affected versionversion=26.3.0 <=26.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Node.jsversion=22.22.3 <=22.22.3; version=24.16.0 <=24.16.0; version=26.3.0 <=26.3.0

Published CVSS scores

3.7HackerOneCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444HTTP Request Smuggling
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo