nimiq-blockchain is missing a wall-clock upper bound on block timestamps
nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In 1.3.0 and earlier, block timestamp validation enforces that timestamp >= 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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-40093
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 22:44 UTC · Revision 1
Source evidence
nimiq-blockchain is missing a wall-clock upper bound on block timestamps
core-osv · Original sourcePublished 9 Apr 2026, 20:29 UTC
nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In 1.3.0 and earlier, block timestamp validation enforces that timestamp >= 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.
osv:CVE-2026-40093
Complete source record
{
"id": "e5d1ab1ec6577f57543a6ac69b2dd696f9f1137ea75c5fb3f1d486cfecb6fdb3",
"url": "https://osv.dev/vulnerability/CVE-2026-40093",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "nimiq-blockchain is missing a wall-clock upper bound on block timestamps",
"summary": "nimiq-blockchain provides persistent block storage for Nimiq's Rust implementation. In 1.3.0 and earlier, block timestamp validation enforces that timestamp >= 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.",
"evidence": "osv:CVE-2026-40093",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-40093",
"aliases": [
"CVE-2026-40093",
"GHSA-49xc-52mp-cc9j"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/nimiq/core-rs-albatross",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "5bd15d9af710abeecdfb63d0a721dc883efb59c4"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "1.3.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"cpe": "cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.3.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40093.json"
}
}
],
"modified": "2026-10-28T02:30:23.951830979Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40093.json",
"https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j",
"https://nvd.nist.gov/vuln/detail/CVE-2026-40093"
],
"provider_metadata": {
"cwe_ids": [
"CWE-1284"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40093.json"
}
},
"related_cves": [
{
"value": "CVE-2026-40093",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490628,
"published_at": "2026-04-09T20:29:46.026+00:00"
}