CVE-2026-39885

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Source

https://cve.org/CVERecord?id=CVE-2026-39885

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39885.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-39885

Aliases

GHSA-v6ph-xcq9-qxxj

Published

2026-04-08T20:34:20Z

Modified

2026-10-21T02:57:09Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator

Summary

FrontMCP Affected by SSRF via $ref Dereferencing in Untrusted OpenAPI Specifications

Details

FrontMCP is a TypeScript-first framework for the Model Context Protocol (MCP). Prior to 2.3.0, the mcp-from-openapi library uses @apidevtools/json-schema-ref-parser to dereference $ref pointers in OpenAPI specifications without configuring any URL restrictions or custom resolvers. A malicious OpenAPI specification containing $ref values pointing to internal network addresses, cloud metadata endpoints, or local files will cause the library to fetch those resources during the initialize() call. This enables Server-Side Request Forgery (SSRF) and local file read attacks when processing untrusted OpenAPI specifications. This vulnerability is fixed in 2.3.0.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-918"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39885.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "2.3.0"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StringRangeExpression"
                }
            ]
        }
    ]
}

References

Affected packages

Git / github.com/agentfront/frontmcp

Affected ranges

Type

GIT

Repo

https://github.com/agentfront/frontmcp

Events

Introduced

Fixed

c13e7651968d08223bcf996d4d39f84fe2040c4c

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.0.4"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "original_tag":  "v1.0.4",
            "range":  [
                {
                    "fixed":  "c13e7651968d08223bcf996d4d39f84fe2040c4c"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "cpe":  "cpe:2.3:a:agentfront:\\@frontmcp\\/adapters:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.0.4"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:agentfront:\\@frontmcp\\/sdk:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.0.4"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:agentfront:frontmcp:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "1.0.4"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Affected versions

v0.*

v0.2.5

v0.3.0

v0.3.1

v0.4.0

v0.5.0

v0.5.1

v0.6.0

v0.6.1

v0.6.2

v0.6.3

v0.7.1

v0.7.2

v0.8.0

v0.8.1

v1.*

v1.0.0

v1.0.0-beta.1

v1.0.0-beta.10

v1.0.0-beta.11

v1.0.0-beta.12

v1.0.0-beta.13

v1.0.0-beta.14

v1.0.0-beta.2

v1.0.0-beta.3

v1.0.0-beta.4

v1.0.0-beta.5

v1.0.0-beta.6

v1.0.0-beta.7

v1.0.0-beta.8

v1.0.0-beta.9

v1.0.0-rc.1

v1.0.1

v1.0.2

v1.0.3

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39885.json"