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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-54754: 0.43% estimated exploitation activity in the next 30 days; percentile 37.60 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary When a marketplace order is settled (MarketBuy / BuyItNow, and auction Claim), the buyer's payment is split three ways — referral, royalties, and the seller (market-order owner) remainder: Referral and royalties are paid out unconditionally, but the seller remainder is only paid when positive (computeMarketOwnerAmount returns Ok and pays nothing when the amount is <= 0). When referral% + royalty% exceeds 100% of the bid, marketOwnerAmount goes negative and is silently skipped — so the marketplace pays out more KLV / sale currency than the buyer paid in, minting the difference out of thin air. The combined ceiling royalty% + referral% <= 100% is checked once, at listing time (Sell). But the two percentages are sourced asymmetrically at settlement: - referral % is snapshotted into the order at Sell (MarketOrderData.ReferralPercentage); - royalty % is never snapshotted — it is read live from the asset at buy time (asset.Royalties.MarketPercentage). So the listing-time invariant…

Published by the source

28 Aug 2026, 16:22 UTC

Last modified by the source

2 Sep 2026, 19:30 UTC

Source last checked

26 Oct 2026, 15:28 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-p7gw-2pcp-5pf8

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6315

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-p7gw-2pcp-5pf8

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-54754

Advisory: Klever: Marketplace settlement mints KLV when referral % + royalty % exceed the bid (negative seller share silently skipped)
IDs: CVE-2026-54754, GHSA-p7gw-2pcp-5pf8
Record: https://patchnext.com/advisories/cve-2026-54754 (revision 3, source checked 26 Oct 2026, 15:28 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.6)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/klever-io/klever-go 1.7.19. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/klever-io/klever-go: affected < 1.7.19; fixed in 1.7.19

## Suggested inspection (read-only)
- Go github.com/klever-io/klever-go: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/klever-io/klever-go.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-p7gw-2pcp-5pf8 (OSV record GHSA-p7gw-2pcp-5pf8 lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.19 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6315 (OSV record GO-2026-6315 lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.19 (fixed))
- Verified: https://github.com/advisories/GHSA-p7gw-2pcp-5pf8 (GitHub-reviewed advisory GHSA-p7gw-2pcp-5pf8 lists affected ranges: Go github.com/klever-io/klever-go >=0 <1.7.19)

Commands are suggestions: review each one before running it.