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CVE-2026-88899

CriticalPublished

knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header

Published: Sep 10, 2026
Updated: Sep 11, 2026
Assigning CNA: VulnCheck
Evidence observed: Sep 14, 2026

Primary CVSS

9.3/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 37.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-88899PoC
Knowns 0.30.0: Unauthenticated Header Injection Grants AI Agent Unrestricted Access to Host Filesystem

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