CVE-2026-46541: Nimiq core-rs-albatross DHT query poisoning in handle_dht_get

CVE-2026-46541 · Severity: high · CVSS 7.5 · Published 2026-06-10

Nimiq is a blockchain protocol using a Rust-based implementation. A flaw in how the system handles data from its distributed network allows a malicious participant to block legitimate data from being processed. This can lead to a denial-of-service condition where the node fails to synchronize or retrieve necessary records, potentially disrupting blockchain operations.

Technologies: Nimiq Albatross. Vendors: Nimiq.

Quick answers

Is CVE-2026-46541 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-46541 being exploited in the wild.
How severe is CVE-2026-46541?
High severity, with a CVSS score of 7.5, published 10 June 2026.
Which products and versions are affected?
Nimiq Albatross <= 1.3.0.
Is there a fix for CVE-2026-46541?
A patch was published on 2026-04-22: Version 1.4.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-46541 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-46541?
Check whether you run Nimiq Albatross at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A vulnerability exists in the handle_dht_get() function of Nimiq's Rust implementation. The DhtResults accumulator is only initialized upon the successful verification of the first received DHT record. If an attacker-controlled DHT node provides an invalid first record, the accumulator is never created. Consequently, all subsequent valid records from legitimate nodes are discarded with 'DHT inconsistent state' errors. This allows a remote, unauthenticated attacker to poison DHT queries and cause a denial-of-service (DoS) for network lookups. The issue is addressed in version 1.4.0 by ensuring proper initialization of the results accumulator.

Affected products

  • Nimiq core-rs-albatross (Nimiq Rust implementation) <= 1.3.0

Timeline

  • 2026-04-22: patched: Version 1.4.0 released
  • 2026-05-15: advisory: GitHub Security Advisory published
  • 2026-06-10: disclosed: CVE published to NVD

References

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