klever-io klever-go up to 1.7.19 signature verification

Summaryinfo

A vulnerability labeled as problematic has been found in klever-io klever-go up to 1.7.19. Affected by this issue is some unknown functionality. Executing a manipulation can lead to signature verification. The identification of this vulnerability is CVE-2026-58262. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in klever-io klever-go up to 1.7.19. It has been declared as problematic. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-58262 since 06/29/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.7.20 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

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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Once again VulDB remains the best source for vulnerability data.

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