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Asked: 2026-05-30T01:47:53+00:00

Assuming that a C# program uses only managed .NET code, is it possible to

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Assuming that a C# program uses only managed .NET code, is it possible to have a buffer overflow security vulnerability within that program? If so, how would such vulnerability be possible?

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  1. Editorial Team

    Yes, but they are much harder to produce. You can only get buffer overflows if you use certain unsafe constructs, not with "normal" C# code. Memory corrupting code shouldn’t be possible at all, when your code is running with lowered trust.

    A few possibilities for buffer overflows:

    1. Using the unsafe keyword, which allows pointers. Unsafe code is just as easy to get wrong, as pointer based code in C or C++.
    2. Using unsafe APIs, such as the methods from the Marshal class
    3. (Mono only) You can disable array range checking (safety vs. performance trade-off)

    There are also a few other ways to corrupt memory apart from buffer overflows.

    1. StructLayoutKind.Explicit
    2. Wrong native interop signatures

    (The runtime itself is written in C++, so a bug in the runtime can also corrupt memory or overflow a buffer, but I consider that out of scope for this question)

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