Windows 10 kb4535996 for Windows 10 breaks signtool.exe

  • Thread starter Thread starter klafredo
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klafredo

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I just installer kb4535996 (released on 02.27.2020) on Windows 10 64-bit and it breaks signtool.exe

After kb4535996 gets installed signtool.exe will not run. It simply exits,

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C:\>"C:\Program Files (x86)\Windows Kits\10\bin\x64\signtool.exe" /?

C:\>echo %errorlevel%
-107374150

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Once you uninstall kb4535996 is starts working again.

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"C:\Program Files (x86)\Windows Kits\10\bin\x64\signtool.exe" /?
Usage: signtool <command> [options]

Valid commands:
sign -- Sign files using an embedded signature.
timestamp -- Timestamp previously-signed files.
verify -- Verify embedded or catalog signatures.
catdb -- Modify a catalog database.
remove -- Reduce the size of an embedded signed file.

For help on a specific command, enter "signtool <command> /?"

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Is this known? When will it be fixed?

I've testing this on both Windows 10 enterprise and Pro. Same issue.

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