EUVD-2026-70527Severity by source
AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L
AV:N because blocks propagate over the network; AC:H because active mining participation is required; S:C because the forged block corrupts the shared ledger beyond the local node.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
6DescriptionCVE.org
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.
AnalysisAI
Integer overflow in Signum Node's block processing engine prior to v3.9.9 allows a malicious miner to receive an arbitrarily inflated block reward by crafting a block with a negative totalFeeCashBackNqt value. The flaw exists in BlockServiceImpl.applyBlock() and was introduced when the SMART_FEES hardfork (at block ~1,029,000) added fee cash-back and burn accounting logic without overflow guards. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must be an active miner on the Signum network - meaning they must have committed hard-drive capacity under the Proof-of-Commitment algorithm and be capable of forging and submitting blocks. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS vector (AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L, score 7.5) accurately reflects the exploitability profile: network-reachable via block propagation, high complexity due to the mining prerequisite, no separate authentication needed beyond participating in block forging, and a scope-changed integrity impact affecting the entire blockchain ledger. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Signum Node v3.9.9, which contains the fix for this integer overflow; the patched release is available at https://github.com/signum-network/signum-node/releases/tag/v3.9.9. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Signum Node deployments to identify versions prior to v3.9.9 and review active mining operations for exposure. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Integer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today