CVE-2026-82409 Details
Description
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, indexer/common.go serializedDataForUpdateAccounts places the attacker-controlled acc.Name value into an Elasticsearch _bulk JSON and NDJSON request without escaping it. The SetAccountName transaction accepts valid UTF-8 account names containing quotes, backslashes, and newlines, and the resulting name is stored in consensus account state. When an indexer processes the account, those characters can break the JSON string, reject a bulk batch, or inject additional bulk actions that create, overwrite, or delete documents in indices writable by the indexer. The persistent state value is replayed by new or historical indexers, and direct access to the indexing host or Elasticsearch port is not required. This issue is fixed in version 1.7.20.
A vulnerability in Klever-Go's Elasticsearch indexer allows for injection attacks via unescaped account names. This issue affects versions prior to 1.7.20. The vulnerability arises because the indexer serializes account names directly into JSON for Elasticsearch bulk requests without proper escaping. As a result, names containing quotes, backslashes, or newlines can disrupt the JSON format, cause bulk requests to be rejected, or inject unauthorized actions that manipulate documents in Elasticsearch indices. The problem is exacerbated by the default Elasticsearch configuration, which is open and unauthenticated, allowing the injection to reach a private Elasticsearch instance through the node's trusted connection.
Users should update to Klever-Go version 1.7.20, where this vulnerability has been fixed. The update includes a proper escaping of account names in the Elasticsearch bulk serialization, preventing the injection. After updating, ensure that the node's configuration is set to activate the 'fixAuditChangesV3' fork, which is necessary for the consensus-affecting changes to take effect.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 23, 2026CISA-ADP
Assessed Sep 24, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/klever-io/klever-go/commit/f00366768b24be18fa7ae9de2e1905caa8b350af | [email protected] | Source CodeVendor |
| https://github.com/klever-io/klever-go/commit/f54ea730cc80a3ba4f906586a7d221b281548190 | [email protected] | Source CodeVendor |
| https://github.com/klever-io/klever-go/releases/tag/v1.7.20 | [email protected] | Release NotesVendor |
| https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-116 | Improper Encoding or Escaping of Output | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Klever-io Klever-Go | <= v1.7.19 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 24, 2026 | CVE Modified | CISA-ADP |
| Sep 23, 2026 | New CVE Received | [email protected] |