# CVE-2026-48486

## Summary

- **CVE ID:** CVE-2026-48486
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L)
- **CWE:** CWE-190
- **Published:** Sep 3, 2026
- **Last Modified:** Sep 3, 2026

## Description

Signum Node is a HDD-mined cryptocurrency using an energy efficient and fair Proof-of-Commitment (PoC+) consensus algorithm. Prior to version 3.9.9, an integer overflow in BlockServiceImpl.applyBlock() allowed a miner to receive an arbitrarily inflated block reward by crafting a block with a negative totalFeeCashBackNqt value. The vulnerability was introduced when the SMART_FEES hardfork (block ~1,029,000) enabled fee cash-back and burn accounting without overflow protection. This issue has been patched in version 3.9.9.

## Affected Products

- signum-network — signum-node (< 3.9.9)

## References

- [CNA](https://github.com/signum-network/signum-node/security/advisories/GHSA-4vjp-2m22-r2q9)
- [CNA](https://github.com/signum-network/signum-node/releases/tag/v3.9.9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.3

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