Signum Node: Integer overflow in SMART_FEES fee distribution allows arbitrary miner reward inflation
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
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 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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| signum-network | signum-node | before 3.9.9 | 3.9.9 | Patch available | CNA |
- signum-node Vendorsignum-network Affected before 3.9.9 Fixed in 3.9.9 Patch available CNA
Remediation
- Fix · CNA signum-node (signum-network) Fixed in 3.9.9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-48486
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences