nimiq core-rs-albatross up to 1.2.x can_change_balance integer underflow

Summaryinfo

A vulnerability categorized as problematic has been discovered in nimiq core-rs-albatross up to 1.2.x. Affected by this issue is the function VestingContract::can_change_balance. The manipulation results in integer underflow. This vulnerability is reported as CVE-2026-34064. The attack can be launched remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in nimiq core-rs-albatross up to 1.2.x. It has been classified as problematic. Affected is the function VestingContract::can_change_balance. The manipulation with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This is going to have an impact on integrity. CVE summarizes:

nimiq-account contains account primitives to be used in Nimiq's Rust implementation. Prior to version 1.3.0, `VestingContract::can_change_balance` returns `AccountError::InsufficientFunds` when `new_balance balance`, the node crashes while trying to return an error. The `min_cap > balance` precondition is attacker-reachable because the vesting contract creation data (32-byte format) allows encoding `total_amount` without validating `total_amount <= transaction.value` (the real contract balance). After creating such a vesting contract, the attacker can broadcast an outgoing transaction to trigger the panic during mempool admission and block processing. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34064 since 03/25/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 1.3.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 4d01946f0b3d6c6e31786f91cdfb3eb902908da0 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• nimiq

Name

• core-rs-albatross

Version

• 1.0
• 1.1
• 1.2

License

• open-source

Website

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

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