Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · 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, core/kapp/validators/validators.go Register and the runtime validator update path accept a submitted BLSPublicKey without curve, prime-order subgroup, or nonzero validation. When a validator with a malformed key becomes eligible and is selected into a consensus group, MultiSigner.Reset and the corresponding signature verification creation path cannot deserialize the group key and cancel the slot. This causes repeated missed rounds and throughput degradation, and a network whose consensus group equals the eligible validator set can halt completely. Genesis validation is not affected because that path already performs CheckPublicKeyValid. 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-9wh6-9hq7-9688 |
- 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-9wh6-9hq7-9688
Remediation
- Fix · CNA klever-go (klever-io) Fixed in 1.7.20
- Fix · GHSA-9wh6-9hq7-9688 github.com/klever-io/klever-go (Go) Fixed in 1.7.20 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-82407
- 2026-10-03 Alias added: GHSA-9wh6-9hq7-9688
References
Other 5
- https://github.com/klever-io/klever-go/security/advisories/GHSA-9wh6-9hq7-9688
- https://github.com/klever-io/klever-go/commit/11606a90ccc289f93d0175994733229b332d9cff
- https://github.com/klever-io/klever-go/commit/642da967893884d635986fed3c43bdc679cbfe8f
- 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-2026-82407 · CVE Program
- CVE-2026-82407 · NVD
- FIRST EPSS
- GHSA-9wh6-9hq7-9688 · 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