Klever-Go: Integer overflow in split-royalty validation enables unbounded minting of KLV (native token) (CVE-2026-54755) | HOL Guard CVE

Critical · CVSS 9.6CVE-2026-54755GHSA-CGC5-V3F2-8M2V

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

Answer in brief

CVE-2026-54755 records a Critical severity (CVSS 9.6) vulnerability in Klever-Go: Integer overflow in split-royalty validation enables unbounded minting of KLV (native token). The current sources do not mark it as known exploited. The current feed maps klever-io/klever-go (generic), github.com/klever-io/klever-go (go). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.6
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 9.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps klever-io/klever-go (generic), github.com/klever-io/klever-go (go). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
klever-io/klever-gogeneric	< 1.7.19	Not reported
github.com/klever-io/klever-gogo	<1.7.19	1.7.19

Recommended response

Check inventory. Check lockfiles and deployed manifests for klever-io/klever-go, github.com/klever-io/klever-go.
Review the reported fix. Update github.com/klever-io/klever-go to 1.7.19 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.