Publish GHSA-cxpw-2g23-2vgw

Author: advisory-database[bot]

advisories/github-reviewed/2026/02/GHSA-cxpw-2g23-2vgw/GHSA-cxpw-2g23-2vgw.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-cxpw-2g23-2vgw",
+  "modified": "2026-02-20T21:52:44Z",
+  "published": "2026-02-20T21:52:44Z",
+  "aliases": [
+    "CVE-2026-27576"
+  ],
+  "summary": "OpenClaw: ACP prompt-size checks missing in local stdio bridge could reduce responsiveness with very large inputs",
+  "details": "## Vulnerability\n\nThe ACP bridge accepted very large prompt text blocks and could assemble oversized prompt payloads before forwarding them to `chat.send`.\n\nBecause ACP runs over local stdio, this mainly affects local ACP clients (for example IDE integrations) that send unusually large inputs.\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `<= 2026.2.17`\n- Patched version: `2026.2.18` (planned next release)\n\n## Impact\n\n- Local ACP sessions may become less responsive when very large prompts are submitted\n- Larger-than-expected model usage/cost when oversized text is forwarded\n- No privilege escalation and no direct remote attack path in the default ACP model\n\n## Affected Components\n\n- `src/acp/event-mapper.ts`\n- `src/acp/translator.ts`\n\n## Remediation\n\n- Enforce a 2 MiB prompt-text limit before concatenation\n- Count inter-block newline separator bytes during pre-concatenation size checks\n- Keep final outbound message-size validation before `chat.send`\n- Avoid stale active-run session state when oversized prompts are rejected\n- Add regression tests for oversize rejection and active-run cleanup\n\n## Fix Commit(s)\n\n- `732e53151e8fbdfc0501182ddb0e900878bdc1e3`\n- `ebcf19746f5c500a41817e03abecadea8655654a`\n- `63e39d7f57ac4ad4a5e38d17e7394ae7c4dd0b9c`\n\nThanks @aether-ai-agent for reporting.",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "openclaw"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "2026.2.19"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 2026.2.17"
+      }
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/openclaw/openclaw/security/advisories/GHSA-cxpw-2g23-2vgw"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/openclaw/openclaw/commit/63e39d7f57ac4ad4a5e38d17e7394ae7c4dd0b9c"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/openclaw/openclaw/commit/8ae2d5110f6ceadef73822aa3db194fb60d2ba68"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/openclaw/openclaw/commit/ebcf19746f5c500a41817e03abecadea8655654a"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/openclaw/openclaw"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/openclaw/openclaw/releases/tag/v2026.2.19"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-400"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-02-20T21:52:44Z",
+    "nvd_published_at": null
+  }
+}