nimiq core-rs-albatross up to 1.2.x get_macro_blocks assertion

Summaryinfo

A vulnerability, which was classified as problematic, has been found in nimiq core-rs-albatross up to 1.2.x. Affected by this issue is the function get_macro_blocks. The manipulation leads to assertion. This vulnerability is documented as CVE-2026-34069. The attack can be initiated remotely. There is not any exploit available. 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 rated as problematic. This issue affects the function get_macro_blocks. The manipulation with an unknown input leads to a assertion vulnerability. Using CWE to declare the problem leads to CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. Impacted is availability. The summary by CVE is:

nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. In versions 1.2.2 and below, an unauthenticated p2p peer can cause the RequestMacroChain message handler task to panic. Sending a RequestMacroChain message where the first locator hash on the victim’s main chain is a micro block hash (not a macro block hash) causes said panic. The RequestMacroChain::handle handler selects the locator based only on "is on main chain", then calls get_macro_blocks() and panics via .unwrap() when the selected hash is not a macro block (BlockchainError::BlockIsNotMacro). This issue has been fixed in version 1.3.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-34069 since 03/25/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, 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 ae6c1e92342e72f80fd12accbe66ee80dd6802ac 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.

Several companies clearly confirm that VulDB is the primary source for best 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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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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