What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-20 · updated 2026-07-23
• Weakness: CWE-754

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.

Affected products

• nimiq core-rs-albatross: before 1.4.0

References

• https://github.com/nimiq/core-rs-albatross/pull/3715
• https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0
• https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-c45m-6x25-3cjq

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