CVE-2026-49343 klever-io CVE debrief

Who should care

Defenders responsible for Klever-Go nodes and validators should assess exposure and prioritize remediation. Defenders should verify exposure and assess remediation for Klever-Go versions prior to 1.7.18, especially for nodes and validators. Exposure may require inventory checks and monitoring for potential attacks.

Why it matters

CVE-2026-49343 is a resource-exhaustion flaw in Klever-Go versions prior to 1.7.18 that affects nodes and validators. Defenders should prioritize verifying exposure and assessing remediation.

• Potential resource-exhaustion attacks may cause nodes and validators to fail to bootstrap or make progress
• Successful attacks may require verification of remediation and compensating controls
• Exposure may require inventory checks and monitoring for potential attacks

Technical summary

The Klever-Go implementation of the Klever blockchain protocol has a resource-exhaustion flaw in versions prior to 1.7.18. The account-data trie syncers are vulnerable to a flaw that leaks bounded throttler slots on error paths, which can cause bootstrap to fail and affect fresh, restarting, or resyncing nodes and validators. The issue is caused by a flaw in the account-data trie syncers that leaks bounded throttler slots on error paths. The fix is in version 1.7.18. Defenders should prioritize verifying exposure and assessing remediation for Klever-Go versions prior to 1.7.18, especially for nodes and validators.

Defensive priority

Defenders should prioritize verifying exposure and assessing remediation for Klever-Go versions prior to 1.7.18, especially for nodes and validators.

Recommended defensive actions

• Verify Klever-Go version and assess exposure
• Review and apply remediation for affected versions
• Monitor for potential resource-exhaustion attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the resource-exhaustion flaw in Klever-Go versions prior to 1.7.18. The issue is caused by a flaw in the account-data trie syncers that leaks bounded throttler slots on error paths. The CVE record was published on 2026-08-07T23:17:04.450Z and has not been modified since then. The NVD entry is currently Deferred. Defenders should verify exposure and assess remediation for Klever-Go versions prior to 1.7.18. The fix is in version 1.7.18.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.