{"id":"CVE-2026-33471","revision":null,"records":[{"revision":"8f591ffb09714727bd1473965a3b6a2f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-33471","aliases":[],"title":"nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation","description":"nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.","state":0,"publishedAt":"2026-04-22T19:13:04.687+00:00","modifiedAt":"2026-04-23T14:15:20.57+00:00","affected":[{"ecosystem":"Vendor product","name":"nimiq-block","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"nimiq\",\n                    \"product\": \"nimiq-block\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.3.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","score":9.6,"severity":"CRITICAL"}],"references":["https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ff","https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823","https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-33471","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-33471","identifiers":["CVE-2026-33471"]},"retained":false,"historicalAffected":[]},{"revision":"d0355c92018448c2a19e3b8e26b0fff6","observedAt":"2026-11-01T05:13:53.499+00:00","statement":{"source":"euvd","id":"EUVD-2026-25054","aliases":["CVE-2026-33471"],"title":"nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) f…","description":"nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","score":9.6,"severity":null}],"references":["https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ff","https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823","https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-25054","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Apr 22, 2026, 7:13:04 PM","dateUpdated":"Apr 23, 2026, 2:15:20 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-25054","identifiers":["EUVD-2026-25054","CVE-2026-33471"]},"retained":false,"historicalAffected":[]},{"revision":"fefd811b8df1441ebc3e63334e2a580f","observedAt":"2026-10-27T09:02:50.23+00:00","statement":{"source":"nvd","id":"CVE-2026-33471","aliases":[],"title":"nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) f…","description":"nimiq-block contains block primitives to be used in Nimiq's Rust implementation. `SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. Prior to version 1.3.0, if an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation. This makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor. The patch for this vulnerability is included as part of v1.3.0. No known workarounds are available.","state":0,"publishedAt":"2026-04-22T20:16:40.317+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","score":9.6,"severity":"CRITICAL"}],"references":["https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823","https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0","https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ff"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-33471","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-20","CWE-190","CWE-345","CWE-1284"],"productCriteria":["cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*"],"sourceDates":{"published":"2026-04-22T20:16:40.317","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-33471","identifiers":["CVE-2026-33471"]},"retained":false,"historicalAffected":[]},{"revision":"e3db119cb74d4461aa42579a7ddc3feb","observedAt":"2026-10-30T17:47:16.231+00:00","statement":{"source":"osv","id":"GHSA-6973-8887-87ff","aliases":["CVE-2026-33471"],"title":"nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation","description":"### Impact\n`SkipBlockProof::verify` computes its quorum check using `BitSet.len()`, then iterates `BitSet` indices and casts each `usize` index to `u16` (`slot as u16`) for slot lookup. If an attacker can get a `SkipBlockProof` verified where `MultiSignature.signers` contains out-of-range indices spaced by 65536, these indices inflate `len()` but collide onto the same in-range `u16` slot during aggregation.\n\nThis makes it possible for a malicious validator with far fewer than `2f+1` real signer slots to pass skip block proof verification by multiplying a single BLS signature by the same factor.\n\n### Patches\n[The patch for this vulnerability](https://github.com/nimiq/core-rs-albatross/pull/3657) is included as part of [v1.3.0](https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0).\n\n### Workarounds\nNo known workarounds.","state":0,"publishedAt":"2026-04-22T19:13:47+00:00","modifiedAt":"2026-10-30T15:45:11.5360138+00:00","affected":[{"ecosystem":"crates.io","name":"nimiq-block","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.7.2"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-6973-8887-87ff","https://nvd.nist.gov/vuln/detail/CVE-2026-33471","https://github.com/nimiq/core-rs-albatross/pull/3657","https://github.com/nimiq/core-rs-albatross/commit/d02059053181ed8ddad6b59a0adfd661ef5cd823","https://github.com/nimiq/core-rs-albatross","https://github.com/nimiq/core-rs-albatross/releases/tag/v1.3.0"],"sourceUrl":"https://github.com/advisories/GHSA-6973-8887-87ff","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-6973-8887-87ff","identifiers":["GHSA-6973-8887-87ff","CVE-2026-33471"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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