---
id: CVE-2026-48486
title: >-
  Signum Node is a HDD-mined cryptocurrency using an energy efficient and fair
  Proof-of-Commitment (PoC+) consensus algorithm
summary: >-
  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 arbit…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L'
cwe:
  - CWE-190
published: '2026-09-03'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48486'
references:
  - url: 'https://github.com/signum-network/signum-node/releases/tag/v3.9.9'
    label: security-advisories@github.com
  - url: >-
      https://github.com/signum-network/signum-node/security/advisories/GHSA-4vjp-2m22-r2q9
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00203
epssPercentile: 0.10552
ingestedAt: '2026-09-09T21:22:45.565Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.