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
2026-08-07T22:00:57Z
Modified
2026-10-28T02:30:40Z
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 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-345",
        "CWE-347"
    ],
    "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
0 Unknown introduced commit / All previous commits are affected
Fixed
0b70b0f1a1f5d95ac07c2038c227db7f18976a2a
Fixed
a11cb28e495e608d8034dbe83a91e89d0c68e0f7
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.7.20"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "a11cb28e495e608d8034dbe83a91e89d0c68e0f7"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

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"