CVE-2026-34069 nimiq-consensus panics via RequestMacroChain micro-block locator

What is CVE-2026-34069?

CVE-2026-34069 is a medium-severity vulnerability in nimiq core-rs-albatross, published on 13 Apr 2026.

Official description

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.

Weakness: CWE-617

Which versions are affected by CVE-2026-34069?

2 open source packages ship an affected version, including nimiq-consensus. It affects 1 product.

Products include Nimiq Nimiq Proof-of-Stake.

How do I fix CVE-2026-34069?

No fix has been published for CVE-2026-34069 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-34069 being exploited?

There is no known exploitation of CVE-2026-34069 in the wild and no public exploit code.

Other vulnerabilities in nimiq core-rs-albatross

• CVE-2026-33471 nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation Critical 9.6
• CVE-2026-40093 nimiq-blockchain is missing a wall-clock upper bound on block timestamps High 8.1
• CVE-2026-34063 network-libp2p: Peer can crash the node by opening discovery protocol substream twice High 7.5
• CVE-2026-34065 nimiq-primitives: Node crash due to missing interlink validation in election macro block proposals High 7.5
• CVE-2026-32605 Nimiq: Remote crash via off-by-one signer bounds check in proposal buffer High 7.5

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-48m6-486p-9j8p.