CVE-2026-58262

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Source

https://cve.org/CVERecord?id=CVE-2026-58262

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58262.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-58262

Aliases

GHSA-f9h7-4mmq-vgcq

Published

2026-08-07T22:00:57.154Z

Modified

2026-08-08T11:46:25.703318821Z

Severity

7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

Klever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum

Details

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.

Database specific

{
    "cwe_ids": [
        "CWE-345",
        "CWE-347"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58262.json"
}

References

Affected packages

Git / github.com/klever-io/klever-go

Affected ranges

Type

GIT

Repo

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

Events

Introduced

Fixed

0b70b0f1a1f5d95ac07c2038c227db7f18976a2a

Database specific

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.7.20"
        }
    ]
}

Affected versions

v1.*

v1.7.14

v1.7.15

v1.7.16

v1.7.17

v1.7.18

v1.7.19

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-58262.json"