CVE-2026-88899
knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system.
- Published Sep 10, 2026
- CVSS 9.3 critical
- 0.8% chance of exploitation in the next 30 days (EPSS)
- A fix is available