nimiq core-rs-albatross up to 1.3.x Kademlia from_bytes signature return value

Summaryinfo

A vulnerability was found in nimiq core-rs-albatross up to 1.3.x. It has been declared as problematic. This vulnerability affects the function Ed25519signature::from_bytes of the component Kademlia Handler. Executing a manipulation of the argument signature can lead to return value. This vulnerability is tracked as CVE-2026-40092. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in nimiq core-rs-albatross up to 1.3.x and classified as problematic. This vulnerability affects the function Ed25519signature::from_bytes of the component Kademlia Handler. The manipulation of the argument signature with an unknown input leads to a return value vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. CVE summarizes:

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In versions 1.3.0 and below, a malicious network peer can crash any Nimiq full node by publishing a crafted Kademlia DHT record. The maliciously crafted record would contain a TaggedSigned<ValidatorRecord, KeyPair> with a signature field whose byte length is not exactly 64 in order to cause a crash. When the victim node's DHT verifier calls TaggedSigned::verify, execution reaches Ed25519Signature::from_bytes(sig).unwrap() in the TaggedPublicKey implementation for Ed25519PublicKey. The from_bytes call fails because ed25519_zebra::Signature::try_from rejects slices not 64 bytes, and the unwrap() panics. The BLS TaggedPublicKey implementation correctly returns false on error; only the Ed25519 implementation panics. This issue has been fixed in version 1.4.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-40092 since 04/09/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

Upgrading to version 1.4.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31197). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• nimiq

Name

• core-rs-albatross

Version

• 1.0
• 1.1
• 1.2
• 1.3

Website

• Product: https://github.com/nimiq/core-rs-albatross/

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Once again VulDB remains the best source for vulnerability data.

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