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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-Go 是 Klever 区块链协议的 Go 语言实现。在 1.7.19 版本之前，Klever-Go 允许具备铸币角色（mint-role）的持有者在半同质化代币（SFT）的“增加供应量”路径中，绕过针对有限次数的最大供应量（MaxSupply）限制。 具体而言，在 中， 函数在执行 之前未检查有符号 int64 整数溢出。当通过 中的 提供一个极大的正数 时，会导致 发生回绕（wrap）变为负数。这样一来，有符号的最大供应量比较（ ）会意外通过，从而错误地信用约 MaxInt64 个单位的供应量，并

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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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

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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