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TI-2026-59217 Aliases CVE-2026-86540GHSA-6ph4-r249-58p2GHSA-mc52-mwq4-vfx3

knowns before 0.30.0 Arbitrary Code Execution via LSP Binary

Priority HIGH 72CWE-78Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
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-78.

Summary

knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/config.json file. When a repository with a crafted configuration is opened, the unvalidated binary path is executed twice under the user's account without any verification.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00212 11th 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
Poc
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-mc52-mwq4-vfx3
  • 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-mc52-mwq4-vfx3

Remediation

  • Fix · CNA knowns (knowns-dev) Fixed in 0.30.0
  • Fix · GHSA-mc52-mwq4-vfx3 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-2026-59220 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
    • TI-2026-59219 knowns before 0.30.0 Path Traversal via Import NamePriority MEDIUM 45
    Show all 7 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-86540
  2. 2026-10-03 Alias added: GHSA-6ph4-r249-58p2
  3. 2026-10-06 Alias added: GHSA-mc52-mwq4-vfx3
  4. 2026-10-06 Fix available: npm/[email protected] · GHSA-mc52-mwq4-vfx3
  5. 2026-10-06 CVSS score added · GHSA-mc52-mwq4-vfx3
  6. 2026-10-06 Weakness changed · GHSA-mc52-mwq4-vfx3
  7. 2026-10-06 7 new references · GHSA-mc52-mwq4-vfx3

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-2026-60301 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
  • TI-2026-59220 knowns before 0.30.0 Unauthenticated Management API Exposure 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