---
title: "CVE-2026-54755: Klever: Integer overflow in split-royalty validation enables unbounded minting of KLV (native token)"
url: https://erroneo.us/security/cve/CVE-2026-54755/
description: "CVE-2026-54755 (github.com/klever-io/klever-go (Go)): Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.19, split-royalty…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-28
date_modified: 2026-08-31
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54755"
kev: false
cvss: 9.6
epss: 0.0056
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.6% , percentile 46: FIRST’s model estimates a 0.6% chance of exploitation activity in the next 30 days, higher than 46% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes github.com/klever-io/klever-go (Go) < 1.7.19, fixed in 1.7.19 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Go `github.com/klever-io/klever-go` < 1.7.19 → fixed: 1.7.19

## Affected products (CVE record)

- klever-io klever-go: < 1.7.19

## Severity

- GitHub_M CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H`
- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 0.56% probability of exploitation activity in the next 30 days; percentile 46.

## Sources

- [GitHub Advisory GHSA-cgc5-v3f2-8m2v](https://github.com/advisories/GHSA-cgc5-v3f2-8m2v)
- [CVE.org record CVE-2026-54755](https://www.cve.org/CVERecord?id=CVE-2026-54755)
- [NVD entry CVE-2026-54755](https://nvd.nist.gov/vuln/detail/CVE-2026-54755)
- [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)

---
Source page: https://erroneo.us/security/cve/CVE-2026-54755/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt