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CERT/CC Vulnerability Notes

VU#701544: mpc-lib hardened derivation fails to protect ancestor isolation

Overview Fireblocks' mpc-lib library contains a cryptographic fail-open vulnerability in its BIP32 hardened derivation implementation in the case of a missing private parent key. This breaks the ancestor isolation property of hardened derivation, allowing an attacker with a compromised lower-level signer share to recover the higher-level share it was derived from. Description Fireblocks is a digital-asset custody and…

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