---
id: CVE-2026-47249
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
  1.7.18, the P2P resolver request handling logic is vulnerable to hash-array
  amplification. A connected peer can send a compressed
  RequestDataType_HashArrayTyp…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-400
published: '2026-08-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T20:55:04.493'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47249'
references:
  - url: 'https://github.com/klever-io/klever-go/releases/tag/v1.7.18'
    label: security-advisories@github.com
  - url: >-
      https://github.com/klever-io/klever-go/security/advisories/GHSA-w342-mj6g-v9c4
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00488
epssPercentile: 0.39398
ingestedAt: '2026-09-09T21:22:45.525Z'
---

## Overview

Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.18, the P2P resolver request handling logic is vulnerable to hash-array amplification. A connected peer can send a compressed RequestDataType_HashArrayType direct request that is only 442 bytes on the wire but expands into 200,000 decoded hash entries inside the resolver path. The resolver's antiflood logic counts only a single logical message and the compressed wire size, and while Batch.Decompress() caps the decompressed byte size, it never limits the number of decoded repeated-field items. As a result, both TxResolver and TrieNodeResolver preallocate and iterate over the entire unchecked set of decoded hashes, causing remote memory and CPU amplification against any node that accepts P2P peer connections. This issue is fixed in version 1.7.18.

## Remediation

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