{"cve":"CVE-2026-46539","nvd":{"published":"2026-06-10T00:16:54.097","modified":"2026-07-23T09:10:00.113","status":"Deferred","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9},"cwes":["CWE-345"],"references":["https://github.com/nimiq/core-rs-albatross/pull/3705","https://github.com/nimiq/core-rs-albatross/releases/tag/v1.4.0","https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-799f-29jm-gr6c"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:38:48.522727527+00:00"},"epss":{"cve":"CVE-2026-46539","score":0.0015,"percentile":0.04139,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-799f-29jm-gr6c","url":"https://osv.dev/vulnerability/GHSA-799f-29jm-gr6c","summary":"nimiq-primitives: BlockInclusionProof interlink issue when hops are empty","modified":"2026-06-10T13:45:15.215921409Z","packages":[{"ecosystem":"crates.io","name":"nimiq-primitives","purl":"pkg:cargo/nimiq-primitives","ranges":["<=0.2.0"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}