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Vulnerability record · CVE-2026-28402 · published 27 February 2026

CVE-2026-28402: Nimiq proof-of-stake vulnerability

Nimiq · Nimiq Proof Of Stake

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.

7.1 CVSS 3.1 High EPSS 0.26% · top 84.1% CWE-354 · CWE-354
7.1CVSS 3.1 base score
0.26%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nimiq/core-rs-albatross/commit/6454c26d966858c5520f55739a30b94c17656c85 Patch
https://github.com/nimiq/core-rs-albatross/pull/3623 Patch
https://github.com/nimiq/core-rs-albatross/releases/tag/v1.2.2 Release Notes
https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-7wh6-rmxx-ww47 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-28402), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.