CVE-2026-34061Network attack vector

Consensus interruption via unchecked election interlink

Published Apr 3, 2026 · Updated Apr 3, 2026

Improper block validation in Nimiq core-rs-albatross before 1.3.0 allows remote authenticated users to interrupt consensus. The proposal path's verify_macro_block_proposal() validates other header and state properties but does not compare an election block's header.interlink with the canonical next interlink. Exploitation requires an elected validator proposer; honest validators finalize the malformed header, then reject the decided block during push, interrupting consensus without reported data disclosure or modification.

CVSS severity4.9
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper block validation in Nimiq core-rs-albatross before 1.3.0 allows remote authenticated users to interrupt consensus. The proposal path's verify_macro_block_proposal() validates other header and state properties but does not compare an election block's header.interlink with the canonical next interlink. Exploitation requires an elected validator proposer; honest validators finalize the malformed header, then reject the decided block during push, interrupting consensus without reported data disclosure or modification.

The record

CVE
CVE-2026-34061
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Nimiq
Product
core-rs-albatross
Classifications
CWE-345, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Nimiq · core-rs-albatrossversion=< 1.3.0

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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