Microsoft Visual C++ Runtime Library – Assertion Failure

Question

Microsoft Visual C++ Runtime Library – Assertion Failure

Paul Hassall 15

From August 26th errors have been experienced in applications after Microsoft 365 updated to version 2508.

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We have seen reports of this in Outlook and Access as well. Has anyone else found out if Microsoft is aware of this bug and are fixing it? We have tried raising it in the developer support area but cannot find any valid categories to raise it under.

Viorel 126.7K Reputation points

2025-09-04T05:08:58.9933333+00:00

To work around the problem, maybe it is possible to adjust the VBA code that uses the RegExp object, if it appears in few places. (A similar error can be easily reproduced and solved in Access).
Sen Dong 0 Reputation points

2025-09-06T09:27:47.7733333+00:00

I also found that, could you please tell me if you could solve this problem?
Pano 0 Reputation points

2025-09-09T03:29:28.4466667+00:00

I'm having the same issue. I tried this on a computer with Microsoft 365 and one with. Microsoft Office 2019.
Rolling back the version to any version before 2508 worked for me.

It would be great if they fixed this issue in the next version of word!
John 0 Reputation points

2025-09-09T15:56:44.19+00:00

I have same problem for VBA RegEx

3 answers

Your answer

Viorel 126.7K Reputation points

2025-09-04T05:08:58.9933333+00:00

To work around the problem, maybe it is possible to adjust the VBA code that uses the RegExp object, if it appears in few places. (A similar error can be easily reproduced and solved in Access).
Sen Dong 0 Reputation points

2025-09-06T09:27:47.7733333+00:00

I also found that, could you please tell me if you could solve this problem?
Pano 0 Reputation points

2025-09-09T03:29:28.4466667+00:00

I'm having the same issue. I tried this on a computer with Microsoft 365 and one with. Microsoft Office 2019.
Rolling back the version to any version before 2508 worked for me.

It would be great if they fixed this issue in the next version of word!
John 0 Reputation points

2025-09-09T15:56:44.19+00:00

I have same problem for VBA RegEx

Answer 1

Mike Wolfe 5 MVP

You need to wrap the second parameter in the call to the VBScript.RegExp.Replace method in parentheses (which forces the argument to be passed by value instead of by reference). This error was introduced in Office version 2508. I have raised it directly with the MS Access engineering team (I'm an Access MVP), but have not gotten a direct response from them yet (which is unusual). See this article I wrote for details about the error and example code for the workaround described above.

Paul Hassall 15 Reputation points

2025-09-10T19:19:57.1533333+00:00

We reached out to Microsoft as well, they mentioned they are aware of the issue. No ETAs etc on a fix
John 0 Reputation points

2025-09-11T01:48:04.19+00:00

@Paul Hassall
Thanks for the explanation, but I'm sad to hear there's no confirmed timeline for a fix.
Jaap van der Zwan 0 Reputation points

2026-03-07T12:00:37.56+00:00

To me it is a MS problem. I don't know about codes and expect MS to solve this for me. I don't know if it is related, but since I get the error message a lot of programmes (like facebook and Linkedin) stop unexpectantly and have to be restarted. This happens several times per day. For me, I am very sorry I bought this MS Surface Pro - the ARM processor does not recognise a lot of common programmes (like Adobe Photoshop) and the general performance is at most 5 out of 10 - that is not much for a device that cost me 1500 Euro!!!

Answer 2

John 0

@Paul Hassall Is there any new progress on this version issue?

Answer 3

Sumit D - IA 160.7K Independent Advisor

Hi,

I'm Sumit, here to help with your query on the Microsoft Q&A forums.

Apologies for any inconvenience you are experiencing. I am happy to help you today.

I am aware of no such reports related to VC++ on the community. Can you please try the following:

Uninstall all VC++ redistributables from Settings > Apps > Installed Apps.
Download and install the VC++ AIO pack from https://github.com/abbodi1406/vcredist/releases/download/v0.92.0/VisualCppRedist_AIO_x86_x64.exe

Let me know if it resolves the issue, which it should.

I look forward to your response and am eager to collaborate until we find a solution.

Paul Hassall 15 Reputation points

2025-09-10T19:19:03.73+00:00

This doesnt resolve the issue, Microsoft have told us the only workaround currently is to roll back

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Microsoft Visual C++ Runtime Library – Assertion Failure

3 answers

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