---
id: CVE-2026-55764
title: Klever-Go is the Go implementation of the Klever blockchain protocol
summary: >-
  Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to
  1.7.19, Klever-Go allows a mint-role holder to bypass a finite per-nonce
  MaxSupply on the semi-fungible token add-quantity path. In
  core/kapp/systemAccount/sy…
severity: high
cwe:
  - CWE-190
vendor: klever-io
product: github.com/klever-io/klever-go
affected:
  - github.com/klever-io/klever-go < 1.7.19
patched:
  - github.com/klever-io/klever-go 1.7.19
published: '2026-08-28'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55764'
references:
  - url: >-
      https://github.com/klever-io/klever-go/commit/8bcc600b0ac88070740c63c7ce1c8a968dd85251
    label: security-advisories@github.com
  - url: 'https://github.com/klever-io/klever-go/releases/tag/v1.7.19'
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-mrpp-v6pg-p54x
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-mrpp-v6pg-p54x'
tags:
  - nvd
  - ghsa
  - go
epss: 0.00538
epssPercentile: 0.428
aliases:
  - GHSA-mrpp-v6pg-p54x
ecosystem: go
ingestedAt: '2026-08-28T22:26:19.120Z'
---

## Overview

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, Klever-Go allows a mint-role holder to bypass a finite per-nonce MaxSupply on the semi-fungible token add-quantity path. In core/kapp/systemAccount/systemAcount.go, SFTAddCirculation performed meta.Circulation += amount before evaluating whether Circulation exceeded MaxSupply, without checking for signed int64 overflow. A large positive raw Amount supplied through processSemiFungibleAddQuantity in core/kapp/kda/mint.go can wrap Circulation negative, causing the signed maximum-supply comparison to pass and crediting approximately MaxInt64 units while corrupting the on-chain counter. The fungible path is not affected because its MintedValue <= 0 guard detects the overflow. The correction uses the consensus activation flag FixMarketBuyOverflow. This issue is fixed in version 1.7.19.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-55764)

Affected packages:

- `github.com/klever-io/klever-go < 1.7.19`

Patched in:

- `github.com/klever-io/klever-go 1.7.19`

Source: https://github.com/advisories/GHSA-mrpp-v6pg-p54x