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CVE-2026-55764— Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply

Quick assessment

Affected
klever-io klever-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.19之前版本存在数字错误漏洞，该漏洞源于在core/kapp/systemAccount/systemAcount.go中，SFTAddCirculation未检查signed int64溢出，在执行meta.Circulation += amount后才判断是否超过MaxSupply，通过processSemiFungibleAddQuantity传入大正数amount可使Cir

CVSS 8.7 · High EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.19 affected
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I. Basic Information for CVE-2026-55764

Vulnerability Information
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Vulnerability Title
Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, Klever-Go allows a mint-role holder to bypass a finite per-nonce MaxSupply on the semi-fungible token add-quantity path. In core/kapp/systemAccount/systemAcount.go, SFTAddCirculation performed meta.Circulation += amount before evaluating whether Circulation exceeded MaxSupply, without checking for signed int64 overflow. A large positive raw Amount supplied through processSemiFungibleAddQuantity in core/kapp/kda/mint.go can wrap Circulation negative, causing the signed maximum-supply comparison to pass and crediting approximately MaxInt64 units while corrupting the on-chain counter. The fungible path is not affected because its MintedValue <= 0 guard detects the overflow. The correction uses the consensus activation flag FixMarketBuyOverflow. This issue is fixed in version 1.7.19.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Klever 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.19之前版本存在数字错误漏洞，该漏洞源于在core/kapp/systemAccount/systemAcount.go中，SFTAddCirculation未检查signed int64溢出，在执行meta.Circulation += amount后才判断是否超过MaxSupply，通过processSemiFungibleAddQuantity传入大正数amount可使Cir
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.19 -

II. Public POCs for CVE-2026-55764

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III. Intelligence Information for CVE-2026-55764

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Vendor Advisories for CVE-2026-55764 (1)

Vendor Pages for CVE-2026-55764 (1)

Same Patch Batch · klever-io · 2026-08-28 · 4 CVEs total

CVE-2026-54754 9.6 CRITICAL Klever-Go: Marketplace settlement mints KLV when referral % + royalty % exceed the bid (ne
CVE-2026-54755 9.6 CRITICAL Klever-Go: Integer overflow in split-royalty validation enables unbounded minting of KLV (
CVE-2026-55763 8.7 HIGH Klever-Go: Percentage-transfer royalty skips the source debit at exactly-100% splits

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-190

V. Comments for CVE-2026-55764

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