CVE-2026-65957

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Source

https://cve.org/CVERecord?id=CVE-2026-65957

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-65957.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-65957

Aliases

GHSA-2c3r-q7gv-hp2m

Published

2026-11-11T20:36:21Z

Modified

2026-11-13T02:47:36Z

Severity

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

Summary

Helio: Dashboard sideband CORS origin allowlist matches hostnames by prefix, admitting attacker-controlled origins in open mode

Details

Helio is an MCP proxy that sits between AI agents and the tools they use. Prior to version 0.8.0, the dashboard sideband (default 127.0.0.1:3100) validated CORS request origins by matching the hostname against a private-network string prefix (10., 172.16.–172.31., 192.168.) rather than validating an IP address. A public DNS name such as 192.168.attacker.com, 10.evil.io, or 172.16.pwn.example also satisfies that prefix, so the proxy echoed the attacker origin in Access-Control-Allow-Origin. This issue has been patched in version 0.8.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-346",
        "CWE-942"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65957.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "fixed": "0.8.0"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                }
            ]
        },
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "fixed": "0.8.0"
                        },
                        {
                            "fixed": "0.8.0"
                        }
                    ],
                    "source": "DESCRIPTION"
                }
            ]
        }
    ]
}

References

Affected packages

Git / github.com/gethelio/helio

Affected ranges

Type

GIT

Repo

https://github.com/gethelio/helio

Events

Introduced

Fixed

4ca8329c38b0edbc5e4d782a4e3b0cfc5cd7782e

Fixed

6f9d147a018caae632be7758b42d1b6073495829

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "fixed": "4ca8329c38b0edbc5e4d782a4e3b0cfc5cd7782e"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v0.8.0",
            "range": [
                {
                    "fixed": "6f9d147a018caae632be7758b42d1b6073495829"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v0.*

v0.1.0

v0.1.1

v0.2.0

v0.3.0

v0.4.0

v0.5.0

v0.6.0

v0.7.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-65957.json"