{"id":"GHSA-49xc-52mp-cc9j","summary":"nimiq-blockchain is missing a wall-clock upper bound on block timestamps","details":"### Impact\n\nBlock timestamp validation enforces that `timestamp \u003e= parent.timestamp` for non-skip blocks and `timestamp == parent.timestamp + MIN_PRODUCER_TIMEOUT` for skip blocks, but there is no visible upper bound check against the wall clock. A malicious block-producing validator can set block timestamps arbitrarily far in the future. This directly affects reward calculations via `Policy::supply_at()` and `batch_delay()` in `blockchain/src/reward.rs`, inflating the monetary supply beyond the intended emission schedule.\n\n### Patches\nTBD\n\n### Workarounds\nNo know workarounds.","aliases":["CVE-2026-40093"],"modified":"2026-04-10T20:11:22.935964Z","published":"2026-04-10T19:55:04Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-04-10T19:55:04Z","nvd_published_at":"2026-04-09T21:16:11Z","cwe_ids":["CWE-1284","CWE-20"],"severity":"CRITICAL"},"references":[{"type":"WEB","url":"https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40093"},{"type":"PACKAGE","url":"https://github.com/nimiq/core-rs-albatross"}],"affected":[{"package":{"name":"nimiq-blockchain","ecosystem":"crates.io","purl":"pkg:cargo/nimiq-blockchain"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"1.3.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-49xc-52mp-cc9j/GHSA-49xc-52mp-cc9j.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"}]}