The aeson vulnerability has been fixed in aeson-

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  • github

    The github API for Haskell (by haskell-github)

    still works. In my experience so far, you only need to worry if you define your own combinators, e.g. like in

  • aeson

    A fast Haskell JSON library

    Ah, I see you are working on this already, thank you:

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  • libjwt-typed

    A Haskell implementation of JSON Web Token (JWT)

    I benchmarked my jose library (using the benchmark suite from, which uses criterion); the JSON objects involved are small (< 8 members) and the performance difference is negligible - perhaps slightly faster (don't have to allocate a vector of hash buckets, most of which are unused). I haven't benchmarked performance with huge numbers of members but it's O(1) [amortised, degrading to O(n) for pathological inputs] -> O(log n), so I would expect a small performance decrease for objects with >> 8 members.

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