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critical advisory

Zebra Consensus Failure due to Improper SIGHASH_SINGLE Validation

Zebra 4.4.0 failed to enforce a ZIP-244 consensus rule for V5 transparent transactions, potentially leading to a consensus split with zcashd nodes if an input is signed with `SIGHASH_SINGLE` and there is no corresponding output.

zebra +1 consensus failure signature validation network partition
2r 1t
critical advisory

Zebra Consensus Split Vulnerability Due to SIGHASH_SINGLE Handling

Zebra and zcashd disagree on a consensus rule for V5+ transparent spends related to SIGHASH_SINGLE handling when the input index has no corresponding output, leading to a consensus split where Zebra accepts invalid blocks rejected by zcashd.

Zebra +2 consensus vulnerability blockchain
2r