CVE-2026-88899

CriticalCVSS 9.8/10Last modified Sep 11, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-73

Affected software

Vendor	Product	Versions
knowns-dev	knowns	< 0.31.0

References

Timeline

Published: Sep 10, 2026
Last modified: Sep 11, 2026
NVD status: Deferred

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