Klever-Go: Elasticsearch bulk / painless injection via on-chain account name -> explorer/indexer data forgery
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| klever-io | klever-go | before 1.7.20 | 1.7.20 | Patch available | CNA |
| — | github.com/klever-io/klever-go (Go) | before 1.7.20 | 1.7.20 | Patch available | GHSA-7c7c-373r-gfjj |
- klever-go Vendorklever-io Affected before 1.7.20 Fixed in 1.7.20 Patch available CNA
- github.com/klever-io/klever-go (Go) Vendor— Affected before 1.7.20 Fixed in 1.7.20 Patch available GHSA-7c7c-373r-gfjj
Remediation
- Fix · CNA klever-go (klever-io) Fixed in 1.7.20
- Fix · GHSA-7c7c-373r-gfjj github.com/klever-io/klever-go (Go) Fixed in 1.7.20 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-82409
- 2026-10-03 Alias added: GHSA-7c7c-373r-gfjj
References
Other 5
- https://github.com/klever-io/klever-go/security/advisories/GHSA-7c7c-373r-gfjj
- 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
More klever-io vulnerabilities
- TI-2026-40253 Klever-Go: SFT add-quantity `int64` overflow bypasses a finite per-nonce MaxSupply CVSS 4.0HIGH 8.7
- TI-2026-40252 Klever-Go: Percentage-transfer royalty skips the source debit at exactly-100% splits CVSS 4.0HIGH 8.7
- TI-2026-58874 Klever-Go: /log controls global node logging CVSS 3.1HIGH 8.6
- TI-2026-32588 Klever-Go MultiDataInterceptor: remote OOM via crafted compressed P2P payload CVSS 3.1HIGH 8.6
- TI-2026-39560 Integer underflow in klever-io klever-go CVSS 3.1CRITICAL 9.6
- TI-2026-58875 Resource allocation without limits in klever-io klever-go CVSS 3.1HIGH 7.5
Sources
- CVE-2026-82409 · CVE Program
- CVE-2026-82409 · NVD
- FIRST EPSS
- GHSA-7c7c-373r-gfjj · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences