diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02bb3e8ac8e..612394ce912 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,7 @@ Docs: https://docs.openclaw.ai
 - ACP/Security: escape control and delimiter characters in ACP `resource_link` title/URI metadata before prompt interpolation to prevent metadata-driven prompt injection through resource links. This ships in the next npm release. Thanks @aether-ai-agent for reporting.
 - TTS/Security: make model-driven provider switching opt-in by default (`messages.tts.modelOverrides.allowProvider=false` unless explicitly enabled), while keeping voice/style overrides available, to reduce prompt-injection-driven provider hops and unexpected TTS cost escalation. This ships in the next npm release. Thanks @aether-ai-agent for reporting.
 - Security/Agents: keep overflow compaction retry budgeting global across tool-result truncation recovery so successful truncation cannot reset the overflow retry counter and amplify retry/cost cycles. This ships in the next npm release. Thanks @aether-ai-agent for reporting.
+- Providers/OAuth: harden Qwen and Chutes refresh handling by validating refresh response expiry values and preserving prior refresh tokens when providers return empty refresh token fields, with regression coverage for empty-token responses.
 - BlueBubbles/Security (optional beta iMessage plugin): require webhook token authentication for all BlueBubbles webhook requests (including loopback/proxied setups), removing passwordless webhook fallback behavior. Thanks @zpbrent.
 - iOS/Security: force `https://` for non-loopback manual gateway hosts during iOS onboarding to block insecure remote transport URLs. (#21969) Thanks @mbelinky.
 - Gateway/Security: remove shared-IP fallback for canvas endpoints and require token or session capability for canvas access. Thanks @thewilloftheshadow.
diff --git a/src/agents/chutes-oauth.e2e.test.ts b/src/agents/chutes-oauth.e2e.test.ts
index a4292b3eb28..079dbe361bd 100644
--- a/src/agents/chutes-oauth.e2e.test.ts
+++ b/src/agents/chutes-oauth.e2e.test.ts
@@ -102,4 +102,39 @@ describe("chutes-oauth", () => {
     expect(refreshed.refresh).toBe("rt_old");
     expect(refreshed.expires).toBe(now + 1800 * 1000 - 5 * 60 * 1000);
   });
+
+  it("refreshes tokens and ignores empty refresh_token values", async () => {
+    const fetchFn = withFetchPreconnect(async (input: RequestInfo | URL, init?: RequestInit) => {
+      const url = urlToString(input);
+      if (url !== CHUTES_TOKEN_ENDPOINT) {
+        return new Response("not found", { status: 404 });
+      }
+      expect(init?.method).toBe("POST");
+      return new Response(
+        JSON.stringify({
+          access_token: "at_new",
+          refresh_token: "",
+          expires_in: 1800,
+        }),
+        { status: 200, headers: { "Content-Type": "application/json" } },
+      );
+    });
+
+    const now = 3_000_000;
+    const refreshed = await refreshChutesTokens({
+      credential: {
+        access: "at_old",
+        refresh: "rt_old",
+        expires: now - 10_000,
+        email: "fred",
+        clientId: "cid_test",
+      } as unknown as Parameters<typeof refreshChutesTokens>[0]["credential"],
+      fetchFn,
+      now,
+    });
+
+    expect(refreshed.access).toBe("at_new");
+    expect(refreshed.refresh).toBe("rt_old");
+    expect(refreshed.expires).toBe(now + 1800 * 1000 - 5 * 60 * 1000);
+  });
 });
diff --git a/src/agents/chutes-oauth.ts b/src/agents/chutes-oauth.ts
index 2b3abed84d5..02adf10ce01 100644
--- a/src/agents/chutes-oauth.ts
+++ b/src/agents/chutes-oauth.ts
@@ -218,6 +218,7 @@ export async function refreshChutesTokens(params: {
   return {
     ...params.credential,
     access,
+    // RFC 6749 section 6: new refresh token is optional; if present, replace old.
     refresh: newRefresh || refreshToken,
     expires: coerceExpiresAt(expiresIn, now),
     clientId,
diff --git a/src/providers/qwen-portal-oauth.test.ts b/src/providers/qwen-portal-oauth.test.ts
index 0abe4eddbc9..78b25b583bf 100644
--- a/src/providers/qwen-portal-oauth.test.ts
+++ b/src/providers/qwen-portal-oauth.test.ts
@@ -58,6 +58,48 @@ describe("refreshQwenPortalCredentials", () => {
     expect(result.refresh).toBe("old-refresh");
   });
 
+  it("keeps refresh token when response sends an empty refresh token", async () => {
+    const fetchSpy = vi.fn().mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: async () => ({
+        access_token: "new-access",
+        refresh_token: "",
+        expires_in: 1800,
+      }),
+    });
+    vi.stubGlobal("fetch", fetchSpy);
+
+    const result = await refreshQwenPortalCredentials({
+      access: "old-access",
+      refresh: "old-refresh",
+      expires: Date.now() - 1000,
+    });
+
+    expect(result.refresh).toBe("old-refresh");
+  });
+
+  it("errors when refresh response has invalid expires_in", async () => {
+    const fetchSpy = vi.fn().mockResolvedValue({
+      ok: true,
+      status: 200,
+      json: async () => ({
+        access_token: "new-access",
+        refresh_token: "new-refresh",
+        expires_in: 0,
+      }),
+    });
+    vi.stubGlobal("fetch", fetchSpy);
+
+    await expect(
+      refreshQwenPortalCredentials({
+        access: "old-access",
+        refresh: "old-refresh",
+        expires: Date.now() - 1000,
+      }),
+    ).rejects.toThrow("Qwen OAuth refresh response missing or invalid expires_in");
+  });
+
   it("errors when refresh token is invalid", async () => {
     const fetchSpy = vi.fn().mockResolvedValue({
       ok: false,
diff --git a/src/providers/qwen-portal-oauth.ts b/src/providers/qwen-portal-oauth.ts
index bbed888c9f9..159942ef2a9 100644
--- a/src/providers/qwen-portal-oauth.ts
+++ b/src/providers/qwen-portal-oauth.ts
@@ -8,7 +8,8 @@ const QWEN_OAUTH_CLIENT_ID = "f0304373b74a44d2b584a3fb70ca9e56";
 export async function refreshQwenPortalCredentials(
   credentials: OAuthCredentials,
 ): Promise<OAuthCredentials> {
-  if (!credentials.refresh?.trim()) {
+  const refreshToken = credentials.refresh?.trim();
+  if (!refreshToken) {
     throw new Error("Qwen OAuth refresh token missing; re-authenticate.");
   }
 
@@ -20,7 +21,7 @@ export async function refreshQwenPortalCredentials(
     },
     body: new URLSearchParams({
       grant_type: "refresh_token",
-      refresh_token: credentials.refresh,
+      refresh_token: refreshToken,
       client_id: QWEN_OAUTH_CLIENT_ID,
     }),
   });
@@ -40,15 +41,22 @@ export async function refreshQwenPortalCredentials(
     refresh_token?: string;
     expires_in?: number;
   };
+  const accessToken = payload.access_token?.trim();
+  const newRefreshToken = payload.refresh_token?.trim();
+  const expiresIn = payload.expires_in;
 
-  if (!payload.access_token || !payload.expires_in) {
+  if (!accessToken) {
     throw new Error("Qwen OAuth refresh response missing access token.");
   }
+  if (typeof expiresIn !== "number" || !Number.isFinite(expiresIn) || expiresIn <= 0) {
+    throw new Error("Qwen OAuth refresh response missing or invalid expires_in.");
+  }
 
   return {
     ...credentials,
-    access: payload.access_token,
-    refresh: payload.refresh_token || credentials.refresh,
-    expires: Date.now() + payload.expires_in * 1000,
+    access: accessToken,
+    // RFC 6749 section 6: new refresh token is optional; if present, replace old.
+    refresh: newRefreshToken || refreshToken,
+    expires: Date.now() + expiresIn * 1000,
   };
 }