Signum Network Signum Node up to 3.9.8 Block Service BlockServiceImpl.applyBlock integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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6.8$0-$5k0.86-

Summaryinfo

A vulnerability was found in Signum Network Signum Node up to 3.9.8 and classified as critical. This affects the function BlockServiceImpl.applyBlock of the component Block Service. The manipulation results in integer overflow. This vulnerability is reported as CVE-2026-48486. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Signum Network Signum Node up to 3.9.8. It has been classified as critical. Affected is the function BlockServiceImpl.applyBlock of the component Block Service. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-48486 since 05/21/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 3.9.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-70527). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Signum Node 3.9.9

Timelineinfo

05/21/2026 CVE reserved
09/03/2026 +105 days Advisory disclosed
09/03/2026 +0 days VulDB entry created
09/03/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-48486 (🔒)
GCVE (CVE): GCVE-0-2026-48486
GCVE (VulDB): GCVE-100-398472
EUVD: 🔒

Entryinfo

Created: 09/03/2026 17:54
Updated: 09/03/2026 21:09
Changes: 09/03/2026 17:54 (65), 09/03/2026 21:09 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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