CVE-2026-49343Public exploitNetwork attack vector

Epoch bootstrap denial via leaked throttler slots

Published Aug 7, 2026 · Updated Aug 7, 2026

Resource exhaustion in Klever klever-go before 1.7.18 allows remote attackers to halt epoch bootstrap through failed trie synchronization. The user and KApp account syncDataTrie functions reserve a NumGoRoutinesThrottler slot but omit EndProcessing when trie creation or synchronization returns an error. Repeated network-dependent trie failures or timeouts exhaust the bounded slots, stop state synchronization, and prevent fresh, restarting, or resyncing nodes and validators from completing bootstrap.

CVSS severity5.9
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Klever klever-go before 1.7.18 allows remote attackers to halt epoch bootstrap through failed trie synchronization. The user and KApp account syncDataTrie functions reserve a NumGoRoutinesThrottler slot but omit EndProcessing when trie creation or synchronization returns an error. Repeated network-dependent trie failures or timeouts exhaust the bounded slots, stop state synchronization, and prevent fresh, restarting, or resyncing nodes and validators from completing bootstrap.

The record

CVE
CVE-2026-49343
Published
Aug 7, 2026
Updated
Aug 7, 2026
Vendor
Klever
Product
klever-go
Classifications
CWE-772, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.7.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Klever · klever-goversion=< 1.7.18

Published CVSS scores

5.9GitHub Security AdvisoryCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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