CVE-2026-48486 Details
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.
An integer overflow vulnerability has been identified in Signum Node versions prior to 3.9.9. The issue arises in the BlockServiceImpl.applyBlock() method, where unchecked arithmetic allows miners to manipulate block rewards. By crafting a block with a negative totalFeeCashBackNqt value, a miner could receive an excessively inflated reward. This vulnerability was introduced during the SMART_FEES hardfork, which enabled fee cash-back and burn accounting without proper overflow protection. Exploitation of this vulnerability occurred on the mainnet at block height 1,541,011, leading to a chain split and corrupted ledger states on affected nodes.
Users are advised to upgrade to Signum Node version 3.9.9 or later. Nodes currently on versions 3.9.7 or 3.9.8 should be aware that these versions lack the necessary chain restoration fix and may become stuck if they encounter a fork.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 3, 2026CISA-ADP
Assessed Sep 3, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/signum-network/signum-node/releases/tag/v3.9.9 | [email protected] | Release NotesVendor |
| https://github.com/signum-network/signum-node/security/advisories/GHSA-4vjp-2m22-r2q9 | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-190 | Integer Overflow or Wraparound | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Signum Node | >= 3.9.0, < 3.9.8 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | CVE Modified | CISA-ADP |
| Sep 3, 2026 | New CVE Received | [email protected] |