# CVE-2026-46369

## Summary

- **CVE ID:** CVE-2026-46369
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-193, CWE-294
- **Published:** Aug 26, 2026
- **Last Modified:** Aug 27, 2026

## Description

Nimiq is a Rust implementation of the Nimiq Proof-of-Stake protocol based on the Albatross consensus algorithm. Through 1.5.0, the validity store uses a strict lower-bound comparison that expires a stored transaction too early relative to Transaction::is_valid_at, allowing a remote attacker to replay the same signed transaction during a blocks_per_batch minus one block window and cause the sender and recipient balances to be updated twice. This issue is fixed in version 1.5.1.

## Affected Products

- nimiq — core-rs-albatross (< 1.5.1)

## References

- [CNA](https://github.com/nimiq/core-rs-albatross/security/advisories/GHSA-3763-qp59-59vf)
- [CNA](https://github.com/nimiq/core-rs-albatross/pull/3772)
- [CNA](https://github.com/nimiq/core-rs-albatross/commit/a530b2434ebca6e3716f07c73079786fcc6f2e41)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.39%
- **EPSS Percentile:** 32.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._