CVE-2026-104422

The block sync download path in Zebra zebrad before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a...

CVE-2026-104422

Zebra (zebrad) versions before 6.3.0 are vulnerable to a Denial of Service (DoS) attack in the block sync download path. The software reads a block's height from an unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation occurs, without penal...

CVE-2026-104422 Zebra before 6.3.0 Block Sync Denial of Service via Coinbase scriptSig Rewrite

The block sync download path in Zebra zebrad before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a...

EUVD-2026-91433

The block sync download path in Zebra zebrad before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a...

CVE-2026-104422 Zebra before 6.3.0 Block Sync Denial of Service via Coinbase scriptSig Rewrite

The block sync download path in Zebra zebrad before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a...

PT-2026-104233

The block sync download path in Zebra zebrad before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a...

CVE-2026-104422: Insufficient Verification of Data Authenticity

The block sync download path in Zebra zebrad before 6.3.0 reads a block's height from its unvalidated coinbase scriptSig and drops blocks that appear too far behind the tip before consensus validation, without penalizing the supplying peer. Because V5 transaction IDs exclude the scriptSig, a...

EUVD-2025-0216

Malicious code in bioql PyPI...

CVE-2025-24371 Malicious peer can make node stuck in blocksync in github.com/cometbft/cometbft

CometBFT is a distributed, Byzantine fault-tolerant, deterministic state machine replication engine. In the blocksync protocol peers send their base and latest heights when they connect to a new node A, which is syncing to the tip of a network. base acts as a lower ground and informs A that the...

CVE-2025-24371

CVE-2025-24371 affects CometBFT’s blocksync protocol. If a peer first reports a non-existent latest height X and then a lower Y (X>Y), a node may continually try to catch up and become blocked, potentially impacting availability. This is a networked, low-complexity issue with high impact on av...

CVE-2024-52922: Undefined Security Weakness

In Bitcoin Core before 25.1, an attacker can cause a node to not download the latest block, because there can be minutes of delay when an announcing peer stalls instead of complying with the peer-to-peer protocol specification...

Rootstock Labs: JSON RPC methods for debugging enabled by default allow DoS

A vulnerability was discovered in the RSK JSON-RPC server that allowed an attacker to cause a denial of service DoS attack by sending the evmreset command. The server would hang, become slow, and eventually become synced to block 0, resulting in a loss of service and responsiveness to all users...