---
id: CVE-2026-82405
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
  1.7.20, the KleverUpdateAccountPermission built-in authorizes replacement of a
  target account's permissions by checking attacker-controlled
  vmInput.RecipientA…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-863
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 1.7.20
published: '2026-09-23'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T16:17:12.153'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82405'
references:
  - url: 'https://gist.github.com/mabdullah22/a41f90aa5ba86bbebf121f739bd5f5e9'
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/commit/c58740eb74d7ee8f07db1e18a7d6214b5559ba32
    label: security-advisories@github.com
  - url: 'https://github.com/klever-io/klever-go/releases/tag/v1.7.20'
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-97cv-x867-6xhm
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-97cv-x867-6xhm'
  - url: 'https://github.com/klever-io/klever-go'
tags:
  - nvd
  - ghsa
  - go
  - cve.org
  - osv
aliases:
  - GHSA-97cv-x867-6xhm
ecosystem: go
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-24T14:03:22.911530Z'
cvssSource: cna
ingestedAt: '2026-09-23T19:31:04.479Z'
epss: 0.0026
epssPercentile: 0.15805
---

## Overview

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, the KleverUpdateAccountPermission built-in authorizes replacement of a target account's permissions by checking attacker-controlled vmInput.RecipientAddr instead of authenticated vmInput.CallerAddr. An attacker-controlled contract can choose a victim account with configured permissions as RecipientAddr, and contractHasValidPermission can accept the victim's default self-signer as authorization. UpdatePermission can then replace the victim's entire permission set with attacker-supplied Owner permissions, enabling asset theft or permanent lockout without a victim key or signature. Accounts without stored permissions and the native transaction path are not affected. This issue is fixed in version 1.7.20.

## Remediation

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

## Package advisory (CVE-2026-82405)

Affected packages:

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

Patched in:

- `github.com/klever-io/klever-go 1.7.20`

Source: https://github.com/advisories/GHSA-97cv-x867-6xhm