Vulnerability · Published Sep 3, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity integer overflow in signum-node from signum-network. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.3%top 73.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
signum-network	signum-node	< 3.9.9

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

References

https://github.com/signum-network/signum-node/security/advisories/GHSA-4vjp-2m22-r2q9 x_refsource_CONFIRM
https://github.com/signum-network/signum-node/releases/tag/v3.9.9 x_refsource_MISC