CVE-2026-40093
nimiq-blockchain is missing a wall-clock upper bound on block timestamps
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.
INFO
Published Date :
April 9, 2026, 9:16 p.m.
Last Modified :
Oct. 26, 2026, 12:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-40093
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update nimiq-blockchain to a version that enforces block timestamp upper bounds.
- Review block timestamp validation logic for other potential issues.
- Monitor reward calculations after applying the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40093.
| URL | Resource |
|---|---|
| https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j | Broken Link |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40093 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40093
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40093 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40093 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: core-rs-albatross de nimiq, Description: nimiq-blockchain proporciona almacenamiento persistente de bloques para la implementación en Rust de Nimiq. En la versión 1.3.0 y anteriores, la validación de la marca de tiempo del bloque impone que la marca de tiempo >= la marca de tiempo del padre para bloques no omitidos y la marca de tiempo == la marca de tiempo del padre + MIN_PRODUCER_TIMEOUT para bloques omitidos, pero no hay una comprobación visible de límite superior contra el reloj de pared. Un validador malicioso que produce bloques puede establecer las marcas de tiempo de los bloques arbitrariamente lejos en el futuro. Esto afecta directamente los cálculos de recompensa a través de Policy::supply_at() y batch_delay() en blockchain/src/reward.rs, inflando la oferta monetaria más allá del cronograma de emisión previsto. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'nimiq', 'product': 'core-rs-albatross', 'versions': [{'status': 'affected', 'version': '<= 1.3.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-40093', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-13T15:05:36.431662Z'} -
Initial Analysis by [email protected]
Apr. 24, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nimiq:nimiq_proof-of-stake:*:*:*:*:*:rust:*:* versions up to (excluding) 1.3.0 Added Reference Type GitHub, Inc.: https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j Types: Broken Link -
New CVE Received by [email protected]
Apr. 09, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H Added CWE CWE-1284 Added Reference https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-49xc-52mp-cc9j