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CVE-2026-54754— Klever-Go: Marketplace settlement mints KLV when referral % + royalty % exceed the bid (negative seller share silently skipped)

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，位于 中的市场结算逻辑存在不一致：读取 时取自挂牌订单（listing），而读取 时却在购买时实时获取。资产所有者可以先创建一个有效的挂牌订单，随后通过 动态调整版税率，使得推荐佣金与版税率的总和超过出价。 会无条件地支付推荐佣金和版税金额，而 在卖家剩余额非正数时又会静默跳过该部分，导致 、 或拍卖 结算时，向买家支付的 KLV 或销售币种金额可能超过其实际支付金额。这种不一致可能导致产生无储备支持的货币，进而破坏代币

CVSS 9.6 · Critical

Possible ATT&CK Techniques 1 AI

T1071 · Application Layer Protocol

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.19 affected
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I. Basic Information for CVE-2026-54754

Vulnerability Information
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Vulnerability Title
Klever-Go: Marketplace settlement mints KLV when referral % + royalty % exceed the bid (negative seller share silently skipped)
Source: CVE Program / CVE List V5
Vulnerability Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, marketplace settlement in core/kapp/market/market.go reads MarketOrderData.ReferralPercentage from the listing while reading asset.Royalties.MarketPercentage live at purchase time. An asset owner can create a valid listing and then use AssetTrigger UpdateRoyalties to make the combined referral and royalty percentages exceed the bid. executeBuyMarket pays referral and royalty amounts unconditionally while computeMarketOwnerAmount silently skips a nonpositive seller remainder, allowing MarketBuy, BuyItNow, or auction Claim settlement to credit more KLV or sale currency than the buyer paid. This can create unbacked currency and corrupt token supply integrity. This issue is fixed in version 1.7.19.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(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-2026-54754

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III. Intelligence Information for CVE-2026-54754

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Vendor Advisories for CVE-2026-54754 (1)

Vendor Pages for CVE-2026-54754 (1)

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

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
CVE-2026-55764 8.7 HIGH Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-191

V. Comments for CVE-2026-54754

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