Is CVE-2026-88899 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-88899?

CVE-2026-88899 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-88899

Description

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.