CVE-2026-34069
MEDIUM
GHSA-48m6-486p-9j8p
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
1DescriptionNVD
Impact
An unauthenticated p2p peer can cause the RequestMacroChain message handler task to panic by sending a RequestMacroChain message where the first locator hash that is on the victim’s main chain is a micro block hash (not a macro block hash).
In RequestMacroChain::handle, the 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).
Patches
The patch for this vulnerability](https://github.com/nimiq/core-rs-albatross/pull/3660) is formally released as part of v1.3.0.
Workarounds
No known workarounds.
AnalysisAI
Denial of service in Nimiq Core consensus peer handler allows unauthenticated remote attackers to crash the RequestMacroChain message handler by sending a crafted message where the first locator hash on the victim's main chain is a micro block instead of a macro block, triggering an unhandled panic via unwrap() on BlockIsNotMacro error. Vendor-released patch: v1.3.0. …
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External POC / Exploit Code
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