CVE-2026-54755

CRITICAL 9.6

Klever-Go: Integer overflow in split-royalty validation enables unbounded minting of KLV (native token)

CVSS Score

9.6

EPSS Score

0.0%

EPSS Percentile

0th

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, split-royalty fields decoded in core/kapp/builtInFunctions/utils.go can contain values greater than core.HundredPercent, and core/kapp/kda/create.go and core/kapp/kda/trigger.go sum those values in uint32 accumulators. Crafted values such as two 0x80000000 entries wrap the validation sum to zero and pass CheckValid100Params. Royalty payout paths in core/kapp/accounts/accounts.go, core/kapp/market/market.go, and core/kapp/ito/ito.go then credit each oversized split amount and silently discard a negative remainder, allowing ordinary asset transfers, marketplace purchases, or ITO purchases to create unbacked KLV or other assets. This issue is fixed in version 1.7.19.

CWE	CWE-190
Vendor	klever-io
Product	klever-go
Published	Aug 28, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

High

Availability

High

Affected Versions

klever-io / klever-go

< 1.7.19

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/klever-io/klever-go/security/advisories/GHSA-cgc5-v3f2-8m2v github.com: https://github.com/klever-io/klever-go/commit/8bcc600b0ac88070740c63c7ce1c8a968dd85251 github.com: https://github.com/klever-io/klever-go/releases/tag/v1.7.19