CVE-2026-58262
Klever-Go is the Go implementation of the Klever blockchain protocol.
Impact
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, header signature verification counts the unused padding bits of the PubKeysBitmap toward the two-thirds validator quorum. These padding bits do not correspond to any validator and are ignored by the actual BLS aggregate-signature check, so a malicious or compromised block producer can set them to reach the required quorum while gathering fewer genuine validator signatures than the protocol demands. As a result, nodes that import or intercept the header accept it as correctly signed without a real two-thirds quorum, weakening consensus safety and undermining finality. This issue is fixed in version 1.7.20.
Affected products
| Product | Affected versions |
|---|---|
| Klever Blockchain Protocol. | before 1.7.20 |
Versions were read from the advisory text. No structured product data has been published for this record yet.