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Upstream response headers forwarded verbatim (request smuggling) #5

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opened 2026-05-18 02:18:40 +00:00 by renekv · 0 comments
renekv commented 2026-05-18 02:18:40 +00:00
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Severity: High

proxyChatCompletions at cmd/ocgo/main.go:431-433 blindly copies all upstream response headers to the client via copyHeaders(). If the upstream (opencode.ai) were ever compromised or misconfigured, this enables HTTP response splitting and header injection.

Fix: Only forward specific allowlisted headers (e.g. Content-Type) and strip all others.

**Severity: High** `proxyChatCompletions` at `cmd/ocgo/main.go:431-433` blindly copies all upstream response headers to the client via `copyHeaders()`. If the upstream (`opencode.ai`) were ever compromised or misconfigured, this enables HTTP response splitting and header injection. **Fix:** Only forward specific allowlisted headers (e.g. `Content-Type`) and strip all others.
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Reference: opencode/ocgo#5
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