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CVE-2026-39885

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. Th
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6911e61a8524a4b5e6f162a710c904b7e5dc348ae62b9ee98342a49bc10dfb69
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"product":"mcp-from-openapi","vendor":"frontmcp","versions":[{"status":"affected","version":"< 2.3.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/3

{"product":"adapters","vendor":"@frontmcp","versions":[{"status":"affected","version":"< 1.0.4"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/1

{"product":"frontmcp","vendor":"agentfront","versions":[{"status":"affected","version":"< 1.0.4"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/0

{"product":"sdk","vendor":"@frontmcp","versions":[{"status":"affected","version":"< 1.0.4"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/2

Affected products and versions

4 source assertions
{"product":"mcp-from-openapi","vendor":"frontmcp","versions":[{"status":"affected","version":"< 2.3.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/3
{"product":"adapters","vendor":"@frontmcp","versions":[{"status":"affected","version":"< 1.0.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/1
{"product":"frontmcp","vendor":"agentfront","versions":[{"status":"affected","version":"< 1.0.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/0
{"product":"sdk","vendor":"@frontmcp","versions":[{"status":"affected","version":"< 1.0.4"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/affected/2

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/agentfront/frontmcp/releases/tag/v1.0.4","tags":["x_refsource_MISC"],"url":"https://github.com/agentfront/frontmcp/releases/tag/v1.0.4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/references/1
{"tags":["exploit"],"url":"https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/adp/0/references/0
{"name":"https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj","tags":["x_refsource_CONFIRM"],"url":"https://github.com/agentfront/frontmcp/security/advisories/GHSA-v6ph-xcq9-qxxj"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0cc43d1d4c884374505eaa5ee2b55dee09415e23baee95d4e81003ff66f22615 · sha256:786153b99d7cc54a… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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