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You encounter a memory leak issue when an application calls the WinHttpGetProxyForUrl function in Windows 7 or in Windows Server 2008 R2

Article ID: 2703157 - View products that this article applies to.

SYMPTOMS

Assume that you develop an application that makes use of the WinHTTP Web Proxy Auto-Discovery Service (WinHttpAutoProxySvc) or calls the WinHttpGetProxyForUrl function. When you run this application on a computer that is running Windows 7 or Windows Server 2008 R2, you encounter a memory leak issue.

Note The memory leak issue is in the WinHTTP Web Proxy Auto-Discovery Service (WinHttpAutoProxySvc) host process. The issue occurs when the WinHttpGetProxyForUrl function is called. Therefore, the memory usage of the process increases every time that the WinHttpGetProxyForUrl function is called.

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CAUSE

This issue occurs because the cleanup code is not executed in DLL_PROCESS_DETACH when the Jscript.dll file is dynamically unloaded.

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RESOLUTION

To resolve this issue, install one of the following updates, depending on your operating system:

Update for Windows 7
(http://www.microsoft.com/downloads/details.aspx?FamilyId=9ce4295a-59e2-4cf8-aa20-c65b913f72ec)
Update for Windows 7 for x64-based Systems
(http://www.microsoft.com/downloads/details.aspx?FamilyId=c26ec9cd-bb5d-4a44-a0c4-f1dc412c2379)
Update for Windows Server 2008 R2 x64 Edition
(http://www.microsoft.com/downloads/details.aspx?FamilyId=1281e04b-5b18-433a-aa9e-e7d22a52d0d9)
Update for Windows Server 2008 R2 for Itanium-based Systems
(http://www.microsoft.com/downloads/details.aspx?FamilyId=93a44936-f0b1-4900-bd13-8bba43f6fe58)

You can also install the following security update to resolve this issue.

Security update information

To resolve this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to the following Microsoft website:

http://update.microsoft.com

(http://update.microsoft.com/)

For more technical information about the most recent cumulative security update for Internet Explorer, go to the following Microsoft website:

http://www.microsoft.com/technet/security/current.aspx

(http://www.microsoft.com/technet/security/current.aspx)

Note This update was first included in security update 2699988. For more information about the security update, click the following article number to view the article in the Microsoft Knowledge Base:

2699988

(http://support.microsoft.com/kb/2699988/ )

MS12-037: Cumulative security update for Internet Explorer: June 12, 2012

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