CVE-2026-46540 - Nimiq light-blockchain: Light blockchain rebranch issue

CVE-2026-46540 - Nimiq light-blockchain: Light blockchain rebranch issue

https://cvefeed.io/rssfeed/latest.atom / Wed, 06/10/2026 - 05:28
CVE ID :CVE-2026-46540
Published : June 10, 2026, 12:16 a.m. | 2 hours, 48 minutes ago
Description :Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.4.0, when LightBlockchain::rebranch() adopts a fork chain whose tip is a macro block (checkpoint or election), it only updates self.head but fails to update self.macro_head, self.election_head, self.current_validators, or store the election header in the chain_store. This is in direct contrast with the full Blockchain::rebranch() at blockchain/src/blockchain/push.rs:504-518, which correctly updates all macro/election state when the new head is a macro block. After a rebranch to a macro block, the stale macro_head causes subsequent macro blocks pushed via push() to be verified against the wrong predecessor via verify_macro_successor(&this.macro_head). If the rebranch target was an election block, the stale current_validators causes every subsequent block to fail verify_validators(), completely stalling the light client's chain progression. This issue has been patched in version 1.4.0.
Severity: 6.5 | MEDIUM
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