What is the CVSS score of CVE-2026-28402?

CVE-2026-28402 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H. EPSS exploitation probability: 0.0%.

Which versions of Nimiq Proof Of Stake are affected by CVE-2026-28402?

This vulnerability affects Nimiq blockchain validators running core-rs-albatross prior to version 1.2.2, allowing malicious proposers to submit fraudulent macro blocks that could compromise consensus…

How to fix or mitigate CVE-2026-28402?

Within 24 hours: Immediately audit all Nimiq validator instances to identify those running versions below 1.2.2 and assess exposure level. Within 7 days: Isolate or suspend any at-risk validators from proposal participation if feasible within your infrastructure; escalate to Nimiq development team for patch timeline confirmation. Within 30 days: Deploy version 1.2.2 or later once released and thoroughly test in staging environment before production rollout; implement network monitoring to detect anomalous block proposals.

Nimiq Proof Of Stake CVE-2026-28402

HIGH

Improper Validation of Integrity Check Value (CWE-354)

2026-02-27 security-advisories@github.com

Denial Of Service Nimiq Proof Of Stake

7.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.1 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 27, 2026 - 22:16 nvd

HIGH 7.1

DescriptionGitHub Advisory

nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.2.2, a malicious or compromised validator that is elected as proposer can publish a macro block proposal where header.body_root does not match the actual macro body hash. The proposal can pass proposal verification because the macro proposal verification path validates the header but does not validate the binding body_root == hash(body); later code expects this binding and may panic on mismatch, crashing validators. Note that the impact is only for validator nodes. The patch for this vulnerability is formally released as part of v1.2.2. The patch adds the corresponding body root verification in the proposal checks. No known workarounds are available.

AnalysisAI

Authenticated validators in nimiq/core-rs-albatross prior to version 1.2.2 can crash validator nodes by submitting macro block proposals with mismatched body roots that pass verification but cause panics during processing. This vulnerability affects only validator nodes and requires the attacker to be an elected proposer with valid credentials. No patch is currently available, and there is no known workaround.

Technical ContextAI

affects nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm.. nimiq/core-rs-albatross is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.2.2, a malicious or compromised validator that is elected as proposer can publish a macro block proposal where header.body_root does not match the actual macro body hash. The proposal can pass proposal verification because the macro proposal verification path validates the header but does not validate the binding body_root == hash(body); later c