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CVE-2026-48486— Signum Node: Integer overflow in SMART_FEES fee distribution allows arbitrary miner reward inflation

Quick assessment

Affected
signum-network signum-node
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Signum Node 是一种通过硬盘挖矿的加密货币，采用节能且公平的承诺证明（PoC+）共识算法。在 3.9.9 版本之前， 方法中存在整数溢出漏洞，使得矿工可以通过构造具有负数 值的区块，从而获得任意放大的区块奖励。该漏洞是在启用手续费现金返还和燃烧会计功能的 SMART_FEES 硬分叉（区块约 1,029,000）时引入的，当时未对溢出情况进行保护。此问题已在 3.9.9 版本中修复。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
signum-network signum-node < 3.9.9 affected
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I. Basic Information for CVE-2026-48486

Vulnerability Information
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Vulnerability Title
Signum Node: Integer overflow in SMART_FEES fee distribution allows arbitrary miner reward inflation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
signum-network signum-node < 3.9.9 -

II. Public POCs for CVE-2026-48486

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-48486

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Vendor Advisories for CVE-2026-48486 (1)

Vendor Pages for CVE-2026-48486 (1)

IV. Related Vulnerabilities

Same weakness: CWE-190

V. Comments for CVE-2026-48486

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