Nimiq core-rs-albatross up to 1.5.0 Validity Store Transaction::is_valid_at authentication replay

Summaryinfo

A vulnerability was found in Nimiq core-rs-albatross up to 1.5.0. It has been declared as critical. Affected by this issue is the function Transaction::is_valid_at of the component Validity Store. Executing a manipulation can lead to authentication replay. This vulnerability appears as CVE-2026-46369. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in Nimiq core-rs-albatross up to 1.5.0 and classified as critical. This vulnerability affects the function Transaction::is_valid_at of the component Validity Store. The manipulation with an unknown input leads to a authentication replay vulnerability. The CWE definition for the vulnerability is CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Through 1.5.0, the validity store uses a strict lower-bound comparison that expires a stored transaction too early relative to Transaction::is_valid_at, allowing a remote attacker to replay the same signed transaction during a blocks_per_batch minus one block window and cause the sender and recipient balances to be updated twice. This issue is fixed in version 1.5.1.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-46369 since 05/13/2026. 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. The MITRE ATT&CK project declares the attack technique as T1040.

Upgrading to version 1.5.1 eliminates this vulnerability.

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Productinfo

Vendor

• Nimiq

Name

• core-rs-albatross

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5.0

Website

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

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