nimiq core-rs-albatross up to 1.3.0 Block blockchain/src/reward.rs Policy::supply_at improper validation of specified quantity in input

Summaryinfo

A vulnerability labeled as problematic has been found in nimiq core-rs-albatross up to 1.3.0. This impacts the function Policy::supply_at of the file blockchain/src/reward.rs of the component Block Handler. The manipulation results in improper validation of specified quantity in input. This vulnerability is reported as CVE-2026-40093. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in nimiq core-rs-albatross up to 1.3.0. Affected is the function Policy::supply_at of the file blockchain/src/reward.rs of the component Block Handler. The manipulation with an unknown input leads to a improper validation of specified quantity in input vulnerability. CWE is classifying the issue as CWE-1284. The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties. This is going to have an impact on integrity, and availability. CVE summarizes:

nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In 1.3.0 and earlier, block timestamp validation enforces that timestamp >= parent.timestamp for non-skip blocks and timestamp == parent.timestamp + MIN_PRODUCER_TIMEOUT for skip blocks, but there is no visible upper bound check against the wall clock. A malicious block-producing validator can set block timestamps arbitrarily far in the future. This directly affects reward calculations via Policy::supply_at() and batch_delay() in blockchain/src/reward.rs, inflating the monetary supply beyond the intended emission schedule.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-40093 since 04/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• nimiq

Name

• core-rs-albatross

Version

• 1.0
• 1.1
• 1.2
• 1.3.0

Website

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

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