CVE-2026-81356

Analyzed Analyzed - Analysis Complete

HTTP Request Smuggling in Visual Studio Code

Publication date: 2026-09-08

Last updated on: 2026-09-11

Assigner: Microsoft Corporation

Description

Inconsistent interpretation of http requests ('http request/response smuggling') in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-08

Last Modified

2026-09-11

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-81356

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	visual_studio_code	to 1.136.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-444	The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

Attack-Flow Graph

Executive Summary

This vulnerability involves inconsistent interpretation of HTTP requests, also known as HTTP request/response smuggling. It affects Visual Studio Code by allowing an unauthorized attacker to bypass a security feature over a network.

Impact Analysis

An attacker could exploit this to bypass security controls, potentially leading to unauthorized access or data exposure. The high CVSS score (8.2) indicates significant impact, including high confidentiality impact.

Compliance Impact

This vulnerability could lead to unauthorized data access or exposure, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations using affected software should address it to maintain compliance.

Mitigation Strategies

Update Visual Studio Code to the latest version to ensure the security feature bypass is patched. Monitor network traffic for unusual HTTP request patterns that may indicate smuggling attempts.

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