CVE-2026-82407
Klever-Go: Validator registration accepts an unvalidated BLS public key → consensus liveness DoS
- State
- Published
- Severity
- 7.0 High
- Published
- Sep 23, 2026
- Updated
- Sep 23, 2026
- Reserved
- Aug 28, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.0 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H | GitHub_M |
Weaknesses
- CWE-20 Improper Input Validation
Affected Products
| Product | Versions |
|---|---|
klever-goklever-io |
|
References
- 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
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.