---
id: CVE-2026-82409
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, indexer/common.go serializedDataForUpdateAccounts places the
  attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON
  request wi…
severity: high
cvss: 8.4
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:L'
cwe:
  - CWE-116
vendor: klever-io
product: klever-go
affected:
  - klever-go < 1.7.20
patched:
  - github.com/klever-io/klever-go 1.7.20
published: '2026-09-23'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T16:17:12.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82409'
references:
  - url: >-
      https://github.com/klever-io/klever-go/commit/f00366768b24be18fa7ae9de2e1905caa8b350af
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/commit/f54ea730cc80a3ba4f906586a7d221b281548190
    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-7c7c-373r-gfjj
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-7c7c-373r-gfjj'
  - url: 'https://github.com/klever-io/klever-go'
tags:
  - nvd
  - cve.org
  - ghsa
  - go
  - osv
  - exploit-available
aliases:
  - GHSA-7c7c-373r-gfjj
ecosystem: go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-24T15:22:05.678124Z'
cvssSource: cna
ingestedAt: '2026-09-23T19:31:04.480Z'
epss: 0.00268
epssPercentile: 0.16816
---

## Overview

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, indexer/common.go serializedDataForUpdateAccounts places the attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON request without escaping it. The SetAccountName transaction accepts valid UTF-8 account names containing quotes, backslashes, and newlines, and the resulting name is stored in consensus account state. When an indexer processes the account, those characters can break the JSON string, reject a bulk batch, or inject additional bulk actions that create, overwrite, or delete documents in indices writable by the indexer. The persistent state value is replayed by new or historical indexers, and direct access to the indexing host or Elasticsearch port is not required. 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-2026-82409)

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-7c7c-373r-gfjj