GHSA-cxpw-2g23-2vgw

## Vulnerability The ACP bridge accepted very large prompt text blocks and could assemble oversized prompt payloads before forwarding them to `chat.send`. Because ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs. ## Affected Packages / Versions - Package: `openclaw` (npm) - Affected versions: `<= 2026.2.17` - Patched version: `2026.2.18` (planned next release) ## Impact - Local ACP sessions may become less responsive when very large prompts are submitted - Larger-than-expected model usage/cost when oversized text is forwarded - No privilege escalation and no direct remote attack path in the default ACP model ## Affected Components - `src/acp/event-mapper.ts` - `src/acp/translator.ts` ## Remediation - Enforce a 2 MiB prompt-text limit before concatenation - Count inter-block newline separator bytes during pre-concatenation size checks - Keep final outbound message-size validation before `chat.send` - Avoid stale active-run session state when oversized prompts are rejected - Add regression tests for oversize rejection and active-run cleanup ## Fix Commit(s) - `732e53151e8fbdfc0501182ddb0e900878bdc1e3` - `ebcf19746f5c500a41817e03abecadea8655654a` - `63e39d7f57ac4ad4a5e38d17e7394ae7c4dd0b9c` Thanks @aether-ai-agent for reporting.