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CVE-2026-49343: CWE-400: Uncontrolled Resource Consumption in klever-io klever-go

0
Medium
VulnerabilityCVE-2026-49343cvecve-2026-49343cwe-400cwe-772
Published: 08/07/2026 (08/07/2026, 22:18:18 UTC)
Source: CVE Database V5
Vendor/Project: klever-io
Product: klever-go

Description

Klever-Go is the Go implementation of the Klever blockchain protocol. In versions prior to 1.7.18, the account-data trie syncers are vulnerable to a resource-exhaustion flaw that leaks bounded throttler slots on error paths. In syncDataTrie() (in both userAccountsSyncer.go and kappAccountsSyncer.go), StartProcessing() reserves a slot from the NumGoRoutinesThrottler, but the corresponding EndProcessing() is only called on the success path and on the duplicate-root early return. As a result, any error from trie.NewTrie(), trie.NewTrieSyncer(), or trieSyncer.StartSyncing() (including the network-dependent timeout path) permanently consumes one slot for the lifetime of the throttler. An attacker who can repeatedly cause trie-node sync failures or timeouts during bootstrap can exhaust the bounded throttler, after which further account-data trie syncs stop making progress and SyncAccounts() returns a timeout. Because epoch bootstrap in syncUserAccountsState() and syncKappAccountsState() aborts on any such error, this causes bootstrap to fail, a core availability issue affecting fresh, restarting, or resyncing nodes and validators. This issue is fixed in version 1.7.18.

CVSS v3.1

Score 5.9medium

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Technical Details

Data Version
5.2
Assigner Short Name
GitHub_M
Date Reserved
2026-05-29T14:35:45.903Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
null

Threat ID: 6a765bb3bf8831d539436f45

Added to database: 08/07/2026, 22:26:59 UTC

Last updated: 08/07/2026, 22:26:59 UTC

Views: 1

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