Klever-IO Klever-Go up to 1.7.19 Validator Registration validators.go Register BLSPublicKey input validation

Summaryinfo

A vulnerability was found in Klever-IO Klever-Go up to 1.7.19. It has been classified as problematic. Impacted is the function Register of the file core/kapp/validators/validators.go of the component Validator Registration. This manipulation of the argument BLSPublicKey causes input validation. This vulnerability appears as CVE-2026-82407. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Klever-IO Klever-Go up to 1.7.19. It has been declared as problematic. Affected by this vulnerability is the function Register of the file core/kapp/validators/validators.go of the component Validator Registration. The manipulation of the argument BLSPublicKey with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-82407 since 08/29/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.7.20 eliminates this vulnerability.

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Productinfo

Vendor

• Klever-IO

Name

• Klever-Go

Version

• 1.7.0
• 1.7.1
• 1.7.2
• 1.7.3
• 1.7.4
• 1.7.5
• 1.7.6
• 1.7.7
• 1.7.8
• 1.7.9
• 1.7.10
• 1.7.11
• 1.7.12
• 1.7.13
• 1.7.14
• 1.7.15
• 1.7.16
• 1.7.17
• 1.7.18
• 1.7.19

Website

• Product: https://github.com/klever-io/klever-go/

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