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TI-2026-59147 Aliases CVE-2026-86439GHSA-9gfj-28hw-jchp

knowns before 0.30.0 Path Traversal via MCP doc and memory tools

Priority MEDIUM 42CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.

Summary

knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01079 65th percentileScored 2026-11-07
Fix Fixed knowns (knowns-dev): 0.30.0knowns (npm): 0.30.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
knowns-devknownsbefore 0.30.00.30.0Patch availableCNA
—knowns (npm)before 0.30.00.30.0Patch availableGHSA-9gfj-28hw-jchp
  • knowns Vendorknowns-dev Affected before 0.30.0 Fixed in 0.30.0 Patch available CNA
  • knowns (npm) Vendor— Affected before 0.30.0 Fixed in 0.30.0 Patch available GHSA-9gfj-28hw-jchp

Remediation

  • Fix · CNA knowns (knowns-dev) Fixed in 0.30.0
  • Fix · GHSA-9gfj-28hw-jchp knowns (npm) Fixed in 0.30.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    knowns-dev knowns 0.30.0

    7 records Highest priority Priority HIGH 1 HIGH, 5 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-59217 knowns before 0.30.0 Arbitrary Code Execution via LSP BinaryPriority HIGH 72
    • TI-2026-59220 knowns before 0.30.0 Unauthenticated Management API ExposurePriority MEDIUM 50
    • TI-2026-59215 knowns before 0.30.0 Path Traversal via templateFile parameterPriority MEDIUM 46
    Show all 7 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86439
  2. 2026-10-03 Alias added: GHSA-9gfj-28hw-jchp

References

Patch 1

Advisory 2

Other 4

  • TI-2026-60300 knowns through 0.33.0 Authorization Bypass via project.set Bootstrap Exemption CVSS 4.0HIGH 8.7
  • TI-2026-60298 knowns through 0.33.0 Path Traversal via Template Engine CVSS 4.0HIGH 8.6
  • TI-2026-59217 knowns before 0.30.0 Arbitrary Code Execution via LSP Binary CVSS 4.0HIGH 8.5
  • TI-2026-60301 knowns through 0.33.0 Arbitrary Directory Enumeration via workspace browse endpoint CVSS 4.0MEDIUM 6.9
  • TI-2026-60299 knowns through 0.33.0 Path Traversal via code.find MCP tool CVSS 4.0HIGH 7.1
  • TI-2026-60283 knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header CVSS 4.0CRITICAL 9.3
See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences