Vulnerability · Published May 20, 2026 · Assigned by GitHub_M

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

Medium 4.3

In plain English

A medium-severity security flaw in core-rs-albatross from nimiq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 77.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
nimiq	core-rs-albatross	< 1.4.0

Weakness: CWE-754 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References

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