diff --git a/.security-review/suppressions.json b/.security-review/suppressions.json
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+++ b/.security-review/suppressions.json
@@ -0,0 +1,8 @@
+{
+  "suppressions": [
+    {
+      "id": "npmaudit-brace-expansion",
+      "justification": "Bundled transitive of aws-cdk-lib (node_modules/aws-cdk-lib/node_modules/brace-expansion). The latest aws-cdk-lib release (2.261.0 as of 2026-07-21) still ships the vulnerable range; npm cannot override bundled deps, so no fix is available until upstream rebundles (GHSA-3jxr-9vmj-r5cp). Exposure is synth-time only: aws-cdk-lib runs during cdk synth in CI on trusted repo input, never in the deployed Lambda/socket-mode runtime, and the ReDoS requires attacker-controlled brace patterns. Revisit/remove on the next aws-cdk-lib bump that clears npm audit."
+    }
+  ]
+}