CVE-2026-52829
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk36th percentile - higher than 36% of all known CVEs
Summary
ZEBRA (Zcash node) before version 4.5.0 has a vulnerability allowing an unauthenticated IPv4 peer to deterministically terminate a synced node. By completing a P2P handshake and advertising an invalid mempool transaction, the attacker can trigger an assertion in the code, causing a panic/abort that stops the node. The issue is fixed in version 4.5.0.
Risk Assessment
The risk includes remote shutdown of a Zebra node, potentially causing disruptions in the Zcash network and loss of synchronization. The attack requires no authentication.
Recommendation
Upgrade ZEBRA to version 4.5.0 or later. Also monitor nodes for unexpected restarts.
Original NVD description (English source)
ZEBRA is a Zcash node written entirely in Rust. Prior to 4.5.0, an unauthenticated IPv4 peer can deterministically terminate a synced Zebra node using the default Linux dual-stack listener configuration. The handshake path canonicalized an IPv4-mapped IPv6 PeerSocketAddr such as ::ffff:127.0.0.1 to plain IPv4 before storing it through MetaAddr::new_connected, but the mempool misbehavior path forwarded the raw transient address to MetaAddrChange::UpdateMisbehavior. In zebra-network/src/meta_addr.rs, apply_to_meta_addr then compared the canonical address-book entry with the raw update address and reached its unexpected address mismatch assertion. After the misbehavior batch flush, panic equals abort terminated zebrad; the peer only needed to complete a P2P handshake and advertise an invalid mempool transaction. This issue is fixed in version 4.5.0.