CVE-2026-88899 OpenCode - Path Traversal

OpenCode < 0.31.0 contains a path traversal caused by improper validation of the x-opencode-directory header in /api/opencode proxy endpoint, letting remote attackers perform file operations outside the project root, exploit requires crafted request.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.81% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Read, File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
10 September 2026
Updated
15 October 2026
Weakness
CWE-73

Vendor fix

Update to version 0.31.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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