CVE-2026-88899
CVSS v3
9.8
CRITICAL
EPSS Score
0.8 %
exploit probability, as of 2026-09-29
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2026-09-10
- Last Modified
- 2026-09-11
Frequently asked questions
What is 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.
Is CVE-2026-88899 actively exploited?
Active exploitation of CVE-2026-88899 has not been confirmed. Its EPSS score was 0.8% on 2026-09-29, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-88899?
CVE-2026-88899 has a CVSS v3 base score of 9.8 (CRITICAL severity).
Is CVE-2026-88899 affecting your environment?
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