user-1: In testnet, txid:fb7a8658ec015133e36e2cf7ddf7e8c887c3a5becec2f30f24ebfe43e72f4b59
transaction has two inputs.
This two inputs indicate the same txid and vout,
6a08723bc717e1ddf91fa60fde25784ef66952e8687f3bffe391fc2c819dbfd9:1.
Is this a double spending?

user7272: This transaction attempts to exploit the recently disclosed (and fixed) vulnerability regarding the validation of duplicate inputs in a single transaction.
There is an excellent answer on this question on how that vulnerability works.

-1: <p>In testnet, txid:fb7a8658ec015133e36e2cf7ddf7e8c887c3a5becec2f30f24ebfe43e72f4b59
transaction has two inputs.
This two inputs indicate the same txid and vout,
6a08723bc717e1ddf91fa60fde25784ef66952e8687f3bffe391fc2c819dbfd9:1.</p>

<p>Is this a double spending?</p>
 7272: <p>This transaction attempts to exploit the recently disclosed (and fixed) vulnerability regarding the validation of duplicate inputs in a single transaction.</p>

<p>There is an excellent answer on <a href="https://bitcoin.stackexchange.com/q/79481/7272">this</a> question on how that vulnerability works.</p>
