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0xCERT Security Advisory 0xCERT-2026-0176
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Advisory-ID:  0xCERT-2026-0176
Severity:     High
Published:    2026-09-23T20:17:16.893Z
Updated:      2026-10-08T22:46:37.243Z
Chains:       n/a
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0176

Title: CVE-2026-82409: Klever-Go

Summary
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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…

Details
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Summary
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.

Severity
High (CVSS 8.4), as scored by NVD.

Weakness
- - CWE-116

Recommended actions
- - Check whether you run or depend on the affected component and version
- - Apply the vendor's fix or mitigation from the references below

Source & attribution
This 0xCERT advisory summarises CVE-2026-82409 from the U.S. National Vulnerability Database: https://nvd.nist.gov/vuln/detail/CVE-2026-82409. Details may change; refer to the original source for the authoritative record.

References
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- - https://nvd.nist.gov/vuln/detail/CVE-2026-82409
- - https://github.com/klever-io/klever-go/commit/f00366768b24be18fa7ae9de2e1905caa8b350af
- - https://github.com/klever-io/klever-go/commit/f54ea730cc80a3ba4f906586a7d221b281548190
- - https://github.com/klever-io/klever-go/releases/tag/v1.7.20
- - https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj
- - https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj

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