opencode Upgrade Process Exposes Supply-Chain Risk via Unverified curl|bash
shafqatevo · ghdev · 2026-08-14
Security researchers have disclosed a medium-severity supply-chain risk (TOCTOU) in the upgrade process of opencode, an open-source AI coding tool.
- The Vulnerability: The opencode upgrade command uses the risky curl | bash pattern. It fetches a script directly from https://opencode.ai/install and pipes it into a bash process without any integrity verification (like checksums).
- Impact: In the event of DNS poisoning or a compromised server response, attackers could substitute malicious code, executing it with the user's full privileges without any review.
- Recommendation: The industry has been moving away from this pattern. It is recommended to implement mandatory checksum or signature verification before executing remote scripts.
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