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Is there any generic attack on HMAC SHA 256 ?

I am currently reading up on attacks on Hmac sha-256. However most of the papers I've found are about side channel attacks such as Differential power Analysis.

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There are no known practical generic attacks on HMAC-SHA256. Brute-force attacks are generic, but are not practical.

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    $\begingroup$ The closest to a practical attack on HMAC-SHA-256 is that it is easy to exhibit pairs of equivalent keys (just make one the SHA-256 of the more-than-64-byte other). Equivalent keys are not usually considered an attack on a MAC. $\endgroup$
    – fgrieu ♦
    Nov 18, 2022 at 16:05

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