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Unbounded streaming buffers (OOM risk) #6

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opened 2026-05-18 02:18:43 +00:00 by renekv · 0 comments
renekv commented 2026-05-18 02:18:43 +00:00
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Severity: High

In streamAnthropic and streamResponses, text/reasoning content is accumulated in unbounded strings.Builder:

var reasoning strings.Builder
var text strings.Builder

These grow without limit. A malicious upstream that streams an infinite response (or a very long one) causes OOM.

Files: cmd/ocgo/main.go:1063, 1192

Fix: Cap the builders at a reasonable limit (e.g., truncate after N bytes).

**Severity: High** In `streamAnthropic` and `streamResponses`, text/reasoning content is accumulated in unbounded `strings.Builder`: ```go var reasoning strings.Builder var text strings.Builder ``` These grow without limit. A malicious upstream that streams an infinite response (or a very long one) causes OOM. **Files:** `cmd/ocgo/main.go:1063`, `1192` **Fix:** Cap the builders at a reasonable limit (e.g., truncate after N bytes).
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Reference: opencode/ocgo#6
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