How severe is CVE-2026-40093?

CVE-2026-40093 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-40093 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40093?

CVE-2026-40093 affects Nimiq Nimiq Proof-of-stake. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40093?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40093 have an EU (EUVD) identifier?

Yes. CVE-2026-40093 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21146.

When was CVE-2026-40093 published?

CVE-2026-40093 was published on 2026-04-09 and last updated on 2026-06-17.

CVE-2026-40093

CVE-2026-40093 is a high-severity vulnerability in Nimiq Nimiq Proof-of-stake with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21146
Weakness: CWE-1284
Affected product: Nimiq Nimiq Proof-of-stake
Published: 2026-04-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-40093?: 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.
How severe is CVE-2026-40093?: CVE-2026-40093 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-40093 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40093?: CVE-2026-40093 affects Nimiq Nimiq Proof-of-stake. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40093?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40093 have an EU (EUVD) identifier?: Yes. CVE-2026-40093 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21146.
When was CVE-2026-40093 published?: CVE-2026-40093 was published on 2026-04-09 and last updated on 2026-06-17.

References

https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j

Affected products (1)

cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:*

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