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Vulnerability record · CVE-2026-48486 · published 3 September 2026

CVE-2026-48486: Integer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.33% · top 76.1% CWE-190 · Integer overflow Deferred
7.5CVSS 3.1 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
9 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:L

References

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

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-48486), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.