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TI-2026-26386 Aliases CVE-2026-34061

nimiq/core-rs-albatross: Macro block proposal interlink bug

Priority LOW 28CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-345.

Summary

nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.3.0, an elected validator proposer can send an election macro block whose header.interlink does not match the canonical next interlink. Honest validators accept that proposal in verify_macro_block_proposal() because the proposal path validates header shape, successor relation, proposer, body root, and state, but never checks the interlink binding for election blocks. The same finalized block is later rejected by verify_block() during push with InvalidInterlink. Because validators prevote and precommit the malformed header hash itself, the failure happens after Tendermint decides the block, not before voting. This issue has been patched in version 1.3.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00195 9th percentileScored 2026-11-07
Fix Fixed core-rs-albatross (nimiq): 1.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nimiqcore-rs-albatrossbefore 1.3.01.3.0Patch availableCNA
  • core-rs-albatross Vendornimiq Affected before 1.3.0 Fixed in 1.3.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*up to 1.2.2Vulnerablenimiq
  • cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:* Versions up to 1.2.2 Vulnerable ·nimiq

Remediation

  • Fix · CNA core-rs-albatross (nimiq) Fixed in 1.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34061

References

Patch 2

Advisory 1

Other 1

  • TI-2026-26389 nimiq-account: Vesting insufficient funds error can panic CVSS 3.1HIGH 8.2
  • TI-2026-25867 nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation CVSS 3.1CRITICAL 9.6
  • TI-2026-27598 nimiq/core-rs-albatross: Panic in history index request handlers when a full node runs without the history index CVSS 3.1HIGH 7.5
  • TI-2026-26390 nimiq-primitives: Node crash due to missing interlink validation in election macro block proposals CVSS 3.1HIGH 7.5
  • TI-2026-26388 network-libp2p: Peer can crash the node by opening discovery protocol substream twice CVSS 3.1HIGH 7.5
  • TI-2026-25612 nimiq/core-rs-albatross: Discovery handshake limit could underflow and later provoke a deterministic overflow panic CVSS 3.1HIGH 7.5
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences