CVE-2026-81094

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Source
https://cve.org/CVERecord?id=CVE-2026-81094
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81094.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-81094
Aliases
  • GHSA-rx55-5c7h-r56r
Published
2026-08-27T14:50:34.879Z
Modified
2026-08-30T03:30:26.461363392Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
mcp-router CLI before 0.6.3 Binds the MCP Aggregator to All Interfaces Without Requiring Authentication
Details

The mcp-router CLI served its MCP aggregator on every interface and enforced authentication only when the operator asked for it. The serve command in apps/cli/src/commands/serve.ts defaulted its host to the all-interfaces address on a fixed port, and required a token only when the corresponding flag was supplied, so a default invocation exposed the aggregator, and every MCP server it fronted, to anyone able to reach the port. Release 0.6.3 defaults the host to the loopback address and refuses to start without a token whenever the host it is given is not a loopback address; no earlier release carries either check.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81094.json",
    "cwe_ids": [
        "CWE-306"
    ],
    "cna_assigner": "VulnCheck"
}
References

Affected packages

Git / github.com/mcp-router/mcp-router

Affected ranges

Type
GIT
Repo
https://github.com/mcp-router/mcp-router
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
4c4642cfd274097ec8b33ecd3047390829c79d35
Database specific
Show details 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.6.3"
        }
    ]
}

Affected versions

v0.*
v0.2.0
v0.2.1
v0.2.2
v0.3.0
v0.3.1
v0.3.2
v0.3.3
v0.3.4
v0.3.5
v0.3.6
v0.3.7
v0.3.8
v0.4.0
v0.4.1
v0.4.2
v0.4.3
v0.4.5
v0.4.6
v0.4.7
v0.4.8
v0.4.9
v0.5.0
v0.5.1
v0.5.2
v0.5.3
v0.5.4
v0.5.5
v0.5.6
v0.5.7
v0.5.8
v0.5.9
v0.6.0
v0.6.1
v0.6.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81094.json"