CVE-2026-40092
Denial of Service in Nimiq Blockchain Storage
Publication date: 2026-05-20
Last updated on: 2026-05-20
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| nimiq | nimiq-blockchain | to 1.4.0 (exc) |
| nimiq | nimiq-blockchain | 1.4.0 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-252 | The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the nimiq-blockchain software versions 1.3.0 and below. A malicious network peer can crash any Nimiq full node by publishing a specially crafted Kademlia DHT record. The crafted record contains a TaggedSigned object with a signature field that does not have the required 64-byte length. When the victim node attempts to verify this record, the verification process calls a function that expects a 64-byte signature. Because the signature length is incorrect, the function panics and crashes the node. This issue occurs specifically in the Ed25519 signature verification implementation, which panics on invalid input, unlike the BLS implementation that handles errors gracefully. The vulnerability was fixed in version 1.4.0.
How can this vulnerability impact me? :
This vulnerability can cause denial of service by crashing any Nimiq full node that receives a maliciously crafted Kademlia DHT record. An attacker can exploit this to disrupt the operation of nodes, potentially affecting network stability and availability.
What immediate steps should I take to mitigate this vulnerability?
The vulnerability has been fixed in nimiq-blockchain version 1.4.0. The immediate step to mitigate this vulnerability is to upgrade your Nimiq full node to version 1.4.0 or later.