CVE-2026-49343
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5.9
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS probability
- 0.26%
- CWE
- CWE-400, CWE-772
- Published
- 2026-08-07
- Last modified
- 2026-08-13
Affected products
- klever-io klever-go
Weakness type
Related vulnerabilities
- CVE-2026-45769 — ikev2: unbounded client transform storage can lead to resource exhaustion
- CVE-2026-45768 — Suricata ldap: unbounded responses per transaction can lead to resource exhaustion
- CVE-2026-45766 — Suricata nfs: unbounded stateful structures can lead to resource exhaustion
- CVE-2026-45765 — Suricata dnp3: unbounded reassembly can lead to resource exhaustion
- CVE-2026-45759 — Suricata http1: quadratic Content-Disposition processing can lead to denial of service
- CVE-2026-87106 — Consul vulnerable to a denial of service in the native RPC listener
- CVE-2026-9338 — IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities
- CVE-2026-88290 — GV-LPC2011/LPC2211 - Unauthenticated VLSVR Slowloris and Memory Resource Exhaustion