Vulnerability in Nimiq Core-Rs-Albatross
CVE-2026-46539
Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Prior to version 1.4.0, a logic flaw in BlockInclusionProof::is_block_proven causes the function to return true without performing any cryptographic verification when get_interlink_hops yields an empty hop list. This occurs when the target block is at the election block position immediately preceding the election head's epoch. An attacker providing transaction inclusion proofs can forge a MacroBlock header for that epoch position and have it accepted as "proven" without any hash or signature verification. This issue has been patched in version 1.4.0.
EPSS: 0.002 (4.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Nimiq Core-rs-albatross — versions < 1.4.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-46539?
- CVE-2026-46539 is a medium-severity vulnerability in Nimiq Core-Rs-Albatross, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.9/10. Published 2026-06-10.
- How severe is CVE-2026-46539?
- Medium severity. CVSS v3 base score is 5.9 out of 10.