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

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

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/08/2026 - 04:10
CVE ID :CVE-2026-49343
Published : Aug. 7, 2026, 11:17 p.m. | 2 hours, 10 minutes ago
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.
Severity: 5.9 | MEDIUM
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