CVE-2026-104431 Zebra before 6.0.0 Denial of Service via Synchronous Script FFI Verification

Zebra before 6.0.0 contains a denial of service vulnerability that allows unauthenticated peers to stall Tokio workers by submitting mempool transactions requiring expensive synchronous script verification. Attackers can send non-standard high-sigop P2SH transactions that reach...

CVE-2026-104431

Versions of Zebra prior to 6.0.0 are vulnerable to a denial of service (DoS) condition. The root cause is a vulnerability where unauthenticated peers can stall Tokio workers by submitting mempool transactions that require expensive synchronous script verification . Specifically, attackers can tra...

CVE-2026-104429 Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages

Zebra zebrad 5.0.0 before 6.0.0-rc.0 does not apply its per-peer mempool admission cap to transactions received as direct P2P tx messages, because these are queued without the sending peer recorded as their source. A remote inbound peer can push many unique transactions to occupy a disproportiona...

CVE-2026-104429 Zebra before 6.0.0-rc.0 Per-Peer Mempool Admission Bypass via P2P tx Messages

Zebra zebrad 5.0.0 before 6.0.0-rc.0 does not apply its per-peer mempool admission cap to transactions received as direct P2P tx messages, because these are queued without the sending peer recorded as their source. A remote inbound peer can push many unique transactions to occupy a disproportiona...

CVE-2026-104430 Zebra 4.5.0 Consensus Split via P2SH Sigop Overcount

Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy mode rather than zcashd's accurate P2SH mode, overcounting CHECKMULTISIG preceded by OP1 through OP16 as 20 sigops and causing a consensus divergence. Remote attackers can broadcast P2SH spends using...

EUVD-2026-91441

Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy mode rather than zcashd's accurate P2SH mode, overcounting CHECKMULTISIG preceded by OP1 through OP16 as 20 sigops and causing a consensus divergence. Remote attackers can broadcast P2SH spends using...

CVE-2026-104429

The Zebra (zebrad) software, versions 5.0.0 before 6.0.0-rc.0 , is vulnerable to a mempool admission bypass. The root cause is that the system fails to apply per-peer mempool admission caps to transactions received as direct P2P tx messages , as these are queued without recording the sending peer...

EUVD-2026-91440

Zebra zebrad 5.0.0 before 6.0.0-rc.0 does not apply its per-peer mempool admission cap to transactions received as direct P2P tx messages, because these are queued without the sending peer recorded as their source. A remote inbound peer can push many unique transactions to occupy a disproportiona...

CVE-2026-104430

The software zebra zebrad 4.5.0 and zebra-script 7.0.0 contains a vulnerability where P2SH redeem script signature operations are counted in legacy mode instead of the accurate P2SH mode used by zcashd . This causes CHECKMULTISIG preceded by OP_1 through OP_16 to be overcounted as 20 sigops, lead...

CVE-2026-104430 Zebra 4.5.0 Consensus Split via P2SH Sigop Overcount

Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy mode rather than zcashd's accurate P2SH mode, overcounting CHECKMULTISIG preceded by OP1 through OP16 as 20 sigops and causing a consensus divergence. Remote attackers can broadcast P2SH spends using...

CVE-2026-104428 Zebra before 11.0.0 Denial of Service via getblock Verbosity 2

The getblock RPC method in zebra-rpc before 11.0.0, used by the Zcash Foundation's Zebra node, panics on verbosity 2 for a side-chain block because the block's -1 confirmations sentinel is converted to u32 with .expect, aborting the process. Remote unauthenticated attackers, directly or through...

CVE-2026-104428

The zebra-rpc component in the Zcash Foundation's Zebra node (versions before 11.0.0 ) is vulnerable to a Denial of Service (DoS) . The getblock RPC method panics when handling a side-chain block with verbosity 2 because a -1 confirmations sentinel is converted to u32 using .expect() , causing th...

EUVD-2026-91439

The getblock RPC method in zebra-rpc before 11.0.0, used by the Zcash Foundation's Zebra node, panics on verbosity 2 for a side-chain block because the block's -1 confirmations sentinel is converted to u32 with .expect, aborting the process. Remote unauthenticated attackers, directly or through...

CVE-2026-104427

Zebra versions before 6.1.0 are vulnerable to an incomplete cleanup vulnerability within the state write task . This flaw allows remote unauthenticated peers to stall node synchronization by poisoning the parent_error_map . Specifically, an attacker can deliver a coinbase-malleated block that sha...

CVE-2026-104426

Zebra versions before 6.1.0 are susceptible to an inefficient algorithmic complexity vulnerability (CWE-407) within the remaining_transaction_value function. The root cause is the cloning of the entire block-level spent-UTXO map for every transaction during contextual verification. This allows an...

EUVD-2026-91438

Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parenterrormap. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causi...

EUVD-2026-91437

Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remainingtransactionvalue that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactio...

CVE-2026-104426 Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check

Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remainingtransactionvalue that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactio...

CVE-2026-104427 Zebra before 6.1.0 Chain Stall via Stale parent_error_map Entry

Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parenterrormap. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causi...

CVE-2026-104426 Zebra before 6.1.0 Quadratic Complexity DoS via Block Transparent Value Check

Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remainingtransactionvalue that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactio...