Not Failing Securely ('Failing Open') in Visual Studio Code - CVE-2026-81379
Published: September 9, 2026
Vulnerability identifier: #VU148274
CSH Severity: High
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-81379
CWE-ID: CWE-636
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass configured network access restrictions.
The vulnerability exists due to not failing securely (\'failing open\') in the Visual Studio Code agent when processing attacker-controlled content. A remote attacker can influence content so that the agent requests a specially crafted URL to bypass configured network access restrictions.
User interaction is required to run the agent against attacker-controlled content.
Affected software
Visual Studio Code
How to mitigate CVE-2026-81379
Install security update from vendor's website.
Visual Studio Code - update to 1.136.2