CVE-2026-81379Network attack vector

Network-filter bypass via inconsistent URL authority parsing

Published Sep 8, 2026 · Updated Sep 10, 2026

Security feature bypass in Visual Studio Code before 1.136.2 allows remote attackers to reach blocked hosts through Agent mode. The agent network filter parses some URL authorities differently from the request parser, ignores valid denied-domain patterns, and fails open on ambiguous or malformed authorities. Exploitation requires Agent mode with Fetch Web Page or integrated browser tools enabled plus attacker-influenced instructions or content, and it exposes workspace context or local services without causing a service interruption.

CVSS severity8.2
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Security feature bypass in Visual Studio Code before 1.136.2 allows remote attackers to reach blocked hosts through Agent mode. The agent network filter parses some URL authorities differently from the request parser, ignores valid denied-domain patterns, and fails open on ambiguous or malformed authorities. Exploitation requires Agent mode with Fetch Web Page or integrated browser tools enabled plus attacker-influenced instructions or content, and it exposes workspace context or local services without causing a service interruption.

The record

CVE
CVE-2026-81379
Published
Sep 8, 2026
Updated
Sep 10, 2026
Vendor
Microsoft
Product
Visual Studio Code
Classifications
CWE-636, T1567
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=1.0.0 <1.136.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Visual Studio Codeversion=1.0.0 <1.136.2

Published CVSS scores

8.2MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-636Not Failing Securely ('Failing Open')
T1567Exfiltration Over Web Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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