---
title: "CVE-2026-94439: HTTP Server - HTTP Request Smuggling"
description: "An HTTP server improperly continues to read and serve HTTP requests after sending a 2xx response to an HTTP/1 CONNECT request without hijacking the connection, causing request smuggling due to tunnel misinterpretation."
url: https://panop.io/threat-heartbeat/CVE-2026-94439/
---

# CVE-2026-94439 HTTP Server - HTTP Request Smuggling

An HTTP server improperly continues to read and serve HTTP requests after sending a 2xx response to an HTTP/1 CONNECT request without hijacking the connection, causing request smuggling due to tunnel misinterpretation.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.32% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-94439)

## Details

Type

HTTP Request Smuggling

Impact

HTTP Request Smuggling

CVSS vector

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

Published

8 October 2026

Updated

15 October 2026

Weakness

[CWE-444](https://cwe.mitre.org/data/definitions/444.html)

## Vendor fix

Update to the latest version that correctly handles HTTP/1 CONNECT requests by hijacking the connection or properly closing it.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-94439](https://nvd.nist.gov/vuln/detail/CVE-2026-94439)
- [https://go.dev/issue/81744](https://go.dev/issue/81744)
- [https://groups.google.com/g/golang-announce/c/U2fTuyDJznI](https://groups.google.com/g/golang-announce/c/U2fTuyDJznI)
- [https://pkg.go.dev/vuln/GO-2026-6613](https://pkg.go.dev/vuln/GO-2026-6613)
- [https://go.dev/cl/847311](https://go.dev/cl/847311)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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