CVE-2026-48486: Signum-Network Signum-Node

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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: before 3.9.9 (fixed in 3.9.9)

Published 2026-09-03. Last modified 2026-09-09.