Description
When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1 CONNECT converts the connection into a tunnel, the server should not treat the connection as continuing to contain HTTP. The impact of this misbehavior is mostly limited to potential request smuggling, where an intermediate proxy considers the data on the connection to be tunneled and the server considers it to be HTTP.
Published: 2026-10-08
Score: 6.5 Medium
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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History

Fri, 09 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-151
CWE-665

Fri, 09 Oct 2026 01:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-151
CWE-665

Fri, 09 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
First Time appeared Go Standard Library
Go Standard Library net/http
Vendors & Products Go Standard Library
Go Standard Library net/http

Fri, 09 Oct 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-444
References
Metrics threat_severity

None

cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

threat_severity

Moderate


Thu, 08 Oct 2026 23:00:00 +0000

Type Values Removed Values Added
Description When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1 CONNECT converts the connection into a tunnel, the server should not treat the connection as continuing to contain HTTP. The impact of this misbehavior is mostly limited to potential request smuggling, where an intermediate proxy considers the data on the connection to be tunneled and the server considers it to be HTTP.
Title HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http
References

Subscriptions

Go Standard Library Net/http
cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-10-08T22:53:59.976Z

Reserved: 2026-09-21T16:43:04.757Z

Link: CVE-2026-94439

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-08T23:17:04.760

Modified: 2026-10-08T23:17:04.760

Link: CVE-2026-94439

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-08T22:53:59Z

Links: CVE-2026-94439 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-09T03:15:15Z

Weaknesses
  • CWE-444

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