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

> An attacker can manipulate asset royalties to mint unbacked currency during marketplace settlements, corrupting token supply integrity in the Klever blockchain.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Aug 2026
- **Updated:** 31 Aug 2026
- **Also known as:** GHSA-p7gw-2pcp-5pf8, GO-2026-6315

## What is CVE-2026-54754?

CVE-2026-54754 is a critical vulnerability in klever-io klever-go, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-682 (Incorrect Calculation), CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition), CWE-191 (Integer Underflow (Wrap or Wraparound))

## Which versions are affected by CVE-2026-54754?

3 open source packages ship an affected version, including github.com/klever-io/klever-go.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/klever-io/klever-go` | Go | All versions | 1.7.19 |
| `github.com/klever-io/klever-go` | Go | All versions | 1.7.19 |
| `github.com/klever-io/klever-go` | Go | All versions | 1.7.19 |

## How do I fix CVE-2026-54754?

Upgrade github.com/klever-io/klever-go to 1.7.19 or later.

## Is CVE-2026-54754 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54754 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54754 and fix it if it is affected.

What it is: CVE-2026-54754 is a critical vulnerability in klever-io klever-go, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54754 exists.

Affected packages and fixed versions:
- github.com/klever-io/klever-go (Go): affected all versions; fixed in 1.7.19
- github.com/klever-io/klever-go (Go): affected all versions; fixed in 1.7.19
- github.com/klever-io/klever-go (Go): affected all versions; fixed in 1.7.19

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54754/ (Markdown: https://insights.sbomify.com/CVE-2026-54754/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54754
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54754
- OSV: https://osv.dev/vulnerability/CVE-2026-54754

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54754/
Summaries are generated and may contain mistakes; the official description above is the record.