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CVE-2026-49343— Klever-Go KVM: Throttler slot leak in trie account-data sync causes epoch bootstrap / state sync DoS

Quick assessment

Affected
klever-io klever-go
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.18之前版本存在资源管理错误漏洞，该漏洞源于账户数据trie同步器在错误路径上泄漏有界throttler槽，导致资源耗尽，可能造成bootstrap失败，影响节点和验证者的可用性。

CVSS 5.9 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
klever-io klever-go < 1.7.18 affected
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I. Basic Information for CVE-2026-49343

Vulnerability Information
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Vulnerability Title
Klever-Go KVM: Throttler slot leak in trie account-data sync causes epoch bootstrap / state sync DoS
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Klever 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Klever是Klever组织的一个高性能区块链网络，专为去中心化应用、资产管理和智能合约执行而设计。 Klever 1.7.18之前版本存在资源管理错误漏洞，该漏洞源于账户数据trie同步器在错误路径上泄漏有界throttler槽，导致资源耗尽，可能造成bootstrap失败，影响节点和验证者的可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
klever-io klever-go < 1.7.18 -

II. Public POCs for CVE-2026-49343

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III. Intelligence Information for CVE-2026-49343

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Vendor Advisories for CVE-2026-49343 (1)

Other References for CVE-2026-49343 (1)

Same Patch Batch · klever-io · 2026-08-07 · 6 CVEs total

CVE-2026-52878 7.5 HIGH Klever-Go: Unauthenticated nil-pointer DoS in P2P transaction validation can halt the chai
CVE-2026-52879 7.5 HIGH Klever-Go: Unbounded goroutine spawn on direct-message ingress enables peer-driven DoS
CVE-2026-47249 7.5 HIGH Klever-Go KVM: Hash-array amplification in P2P resolver request handling
CVE-2026-52880 7.5 HIGH Klever-Go: REST API slow-header connection exhaustion via Gin Engine.Run
CVE-2026-58262 7.1 HIGH Klever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum

IV. Related Vulnerabilities

Same product: klever-go
Same vendor: klever-io
Same weakness: CWE-400

V. Comments for CVE-2026-49343

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