diff --git a/src/plugins/runtime/channel-runtime-contexts.ts b/src/plugins/runtime/channel-runtime-contexts.ts
index 78e02e264fbf..ec020b62f9ba 100644
--- a/src/plugins/runtime/channel-runtime-contexts.ts
+++ b/src/plugins/runtime/channel-runtime-contexts.ts
@@ -115,6 +115,9 @@ export function createChannelRuntimeContextRegistry(): ChannelRuntimeContextRegi
           return;
         }
         disposed = true;
+        // Detach before the token check: stale leases disposed after a replacement
+        // registered must still release their listener on long-lived signals.
+        params.abortSignal?.removeEventListener("abort", dispose);
         const current = runtimeContexts.get(normalized.mapKey);
         if (!current || current.token !== token) {
           return;
diff --git a/src/plugins/runtime/runtime-channel.test.ts b/src/plugins/runtime/runtime-channel.test.ts
index 0434828c9d50..ba82aa852331 100644
--- a/src/plugins/runtime/runtime-channel.test.ts
+++ b/src/plugins/runtime/runtime-channel.test.ts
@@ -1,4 +1,5 @@
 // Runtime channel tests cover channel plugin runtime send, reply, and capability behavior.
+import { getEventListeners } from "node:events";
 import { describe, expect, it, vi } from "vitest";
 import { createRuntimeChannel } from "./runtime-channel.js";
 
@@ -89,6 +90,60 @@ describe("runtimeContexts", () => {
     lease.dispose();
   });
 
+  it("removes its abort listener when the lease is disposed", () => {
+    const channel = createRuntimeChannel();
+    const controller = new AbortController();
+    const initialListenerCount = getEventListeners(controller.signal, "abort").length;
+    const lease = channel.runtimeContexts.register({
+      channelId: "telegram",
+      accountId: "default",
+      capability: "approval.native",
+      context: { token: "abc" },
+      abortSignal: controller.signal,
+    });
+
+    expect(getEventListeners(controller.signal, "abort")).toHaveLength(initialListenerCount + 1);
+
+    lease.dispose();
+
+    expect(getEventListeners(controller.signal, "abort")).toHaveLength(initialListenerCount);
+  });
+
+  it("removes the stale lease abort listener after a replacement registration", () => {
+    const channel = createRuntimeChannel();
+    const controller = new AbortController();
+    const initialListenerCount = getEventListeners(controller.signal, "abort").length;
+    const staleLease = channel.runtimeContexts.register({
+      channelId: "whatsapp",
+      accountId: "default",
+      capability: "connection.controller",
+      context: { token: "stale" },
+      abortSignal: controller.signal,
+    });
+    channel.runtimeContexts.register({
+      channelId: "whatsapp",
+      accountId: "default",
+      capability: "connection.controller",
+      context: { token: "replacement" },
+      abortSignal: controller.signal,
+    });
+
+    expect(getEventListeners(controller.signal, "abort")).toHaveLength(initialListenerCount + 2);
+
+    // Channel plugins dispose the previous lease after registering its replacement,
+    // so the stale token check must not skip listener cleanup.
+    staleLease.dispose();
+
+    expect(getEventListeners(controller.signal, "abort")).toHaveLength(initialListenerCount + 1);
+    expect(
+      channel.runtimeContexts.get({
+        channelId: "whatsapp",
+        accountId: "default",
+        capability: "connection.controller",
+      }),
+    ).toEqual({ token: "replacement" });
+  });
+
   it("does not register contexts when the abort signal is already aborted", () => {
     const channel = createRuntimeChannel();
     const onEvent = vi.fn();