{"items":[{"id":"NVI-00009112","kind":"vulnerability","title":"nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6973-8887-87ff","CVE-2026-33471"],"plain_summary":"GitHub lists this reviewed advisory for nimiq-block. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-327ac07ee962755f75202b7e0eb8b1f4"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-30T15:35:33.000Z","value":"9.6 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-b545ebde0b571ed1bf8dc4313b20da09"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.217%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.12252. Missing scores are unknown.","source_id":"sr-327ac07ee962755f75202b7e0eb8b1f4"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-b545ebde0b571ed1bf8dc4313b20da09","url":"https://github.com/advisories/GHSA-6973-8887-87ff","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6973-8887-87ff","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:55:49.621Z"},{"id":"sr-327ac07ee962755f75202b7e0eb8b1f4","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-33471","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.377Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-b545ebde0b571ed1bf8dc4313b20da09"],"technology":"nimiq-block","known_exclusions":[],"conditions_summary":"### 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\nThe patch for this vulnerability is included as part of v1.3.0.\n\n### Workarounds\nNo known workarounds.","public_affected_ranges":["< 1.3.0"]}],"null_published_at":"2026-10-31T22:27:15.285Z","source_updated_at":"2026-10-30T15:35:33.000Z","source_disclosed_at":"2026-04-22T19:13:47.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:55:49.621Z"},{"id":"NVI-00009112","kind":"vulnerability","title":"nimiq-block has skip block quorum bypass via out-of-range BitSet indices & u16 truncation","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6973-8887-87ff","CVE-2026-33471"],"plain_summary":"GitHub lists this reviewed advisory for nimiq-block. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-b545ebde0b571ed1bf8dc4313b20da09"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-30T15:35:33.000Z","value":"9.6 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-b545ebde0b571ed1bf8dc4313b20da09"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-b545ebde0b571ed1bf8dc4313b20da09","url":"https://github.com/advisories/GHSA-6973-8887-87ff","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6973-8887-87ff","publisher":"GitHub Advisory Database","observed_at":"2026-10-31T21:55:49.621Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-b545ebde0b571ed1bf8dc4313b20da09"],"technology":"nimiq-block","known_exclusions":[],"conditions_summary":"### 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\nThe patch for this vulnerability is included as part of v1.3.0.\n\n### Workarounds\nNo known workarounds.","public_affected_ranges":["< 1.3.0"]}],"null_published_at":"2026-10-31T22:13:31.284Z","source_updated_at":"2026-10-30T15:35:33.000Z","source_disclosed_at":"2026-04-22T19:13:47.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:55:49.621Z"}],"next_cursor":null,"snapshot_revision":"42594"}