CVE-2026-40094 – nimiq-blockchain: network-libp2p untrusted peer can crash address book via empty peer contact addresses

CVE ID :CVE-2026-40094

Published : May 20, 2026, 10:16 p.m. | 42 minutes ago

Description :nimiq-blockchain provides persistent block storage for Nimiq’s Rust implementation. In versions 1.3.0 and prior, network-libp2p discovery accepts signed PeerContact updates from untrusted peers and stores them in a peer contact book, eventually leading to address book crash. A PeerContact can legally contain an empty addresses list (no intrinsic validation enforces non-empty). Later, PeerContactBook::known_peers builds an address book by taking addresses.first().expect(“every peer should have at least one address”). If the attacker has inserted a signed peer contact with addresses=[], any call to get_address_book (RPC/web client) can panic and crash the node/RPC task depending on panic settings. This issue has been fixed in version 1.4.0.

Severity: 4.3 | MEDIUM

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