diff --git a/extensions/vydra/image-generation-provider.test.ts b/extensions/vydra/image-generation-provider.test.ts
index e98a21cdf99a..514af26ab337 100644
--- a/extensions/vydra/image-generation-provider.test.ts
+++ b/extensions/vydra/image-generation-provider.test.ts
@@ -17,6 +17,13 @@ function fetchCall(fetchMock: ReturnType<typeof vi.fn>, index = 0): [string, Req
   return call as [string, RequestInit];
 }
 
+function oversizedJsonResponse(): Response {
+  return new Response(Buffer.alloc(16 * 1024 * 1024 + 1, 0x20), {
+    status: 200,
+    headers: { "Content-Type": "application/json" },
+  });
+}
+
 describe("vydra image-generation provider", () => {
   installPinnedHostnameTestHooks();
 
@@ -94,6 +101,21 @@ describe("vydra image-generation provider", () => {
     ).rejects.toThrow("Vydra image download exceeds 1 bytes");
   });
 
+  it("rejects image creation JSON responses that exceed the provider cap", async () => {
+    stubVydraApiKey();
+    stubFetch(oversizedJsonResponse());
+
+    const provider = buildVydraImageGenerationProvider();
+    await expect(
+      provider.generateImage({
+        provider: "vydra",
+        model: "grok-imagine",
+        prompt: "draw a cat",
+        cfg: {},
+      }),
+    ).rejects.toThrow("vydra.image-generation: JSON response exceeds 16777216 bytes");
+  });
+
   it("passes request SSRF policy to the image creation request", async () => {
     stubVydraApiKey();
     const fetchMock = stubFetch(
@@ -151,4 +173,19 @@ describe("vydra image-generation provider", () => {
     expect(pollCall[0]).toBe("https://www.vydra.ai/api/v1/jobs/job-456");
     expect(pollCall[1].method).toBe("GET");
   });
+
+  it("rejects job poll JSON responses that exceed the provider cap", async () => {
+    stubVydraApiKey();
+    stubFetch(jsonResponse({ jobId: "job-456", status: "queued" }), oversizedJsonResponse());
+
+    const provider = buildVydraImageGenerationProvider();
+    await expect(
+      provider.generateImage({
+        provider: "vydra",
+        model: "grok-imagine",
+        prompt: "draw a cat",
+        cfg: {},
+      }),
+    ).rejects.toThrow("Vydra job status: JSON response exceeds 16777216 bytes");
+  });
 });
diff --git a/extensions/vydra/shared.ts b/extensions/vydra/shared.ts
index 6532c9c073a4..1bec44e714b7 100644
--- a/extensions/vydra/shared.ts
+++ b/extensions/vydra/shared.ts
@@ -6,6 +6,7 @@ import {
   assertOkOrThrowHttpError,
   createProviderOperationDeadline,
   fetchWithTimeout,
+  readProviderJsonResponse,
   resolveProviderOperationTimeoutMs,
   resolveProviderHttpRequestConfig,
   waitProviderOperationPollInterval,
@@ -287,7 +288,7 @@ async function waitForVydraJob(params: {
       params.fetchFn,
     );
     await assertOkOrThrowHttpError(response, "Vydra job status request failed");
-    const payload = await response.json();
+    const payload = await readProviderJsonResponse<unknown>(response, "Vydra job status");
     const status = resolveVydraResponseStatus(payload);
     if (status === "completed" || extractVydraResultUrls(payload, params.kind).length > 0) {
       return payload;
diff --git a/extensions/vydra/speech-provider.test.ts b/extensions/vydra/speech-provider.test.ts
index f669afc03890..c6a19bf0beed 100644
--- a/extensions/vydra/speech-provider.test.ts
+++ b/extensions/vydra/speech-provider.test.ts
@@ -8,6 +8,12 @@ describe("vydra speech provider", () => {
 
   const provider = buildVydraSpeechProvider();
 
+  const oversizedJsonResponse = () =>
+    new Response(Buffer.alloc(16 * 1024 * 1024 + 1, 0x20), {
+      status: 200,
+      headers: { "Content-Type": "application/json" },
+    });
+
   afterEach(() => {
     vi.unstubAllGlobals();
     vi.restoreAllMocks();
@@ -103,4 +109,18 @@ describe("vydra speech provider", () => {
       }),
     ).rejects.toThrow("Vydra audio download exceeds 1 bytes");
   });
+
+  it("rejects speech synthesis JSON responses that exceed the provider cap", async () => {
+    vi.stubGlobal("fetch", vi.fn().mockResolvedValueOnce(oversizedJsonResponse()));
+
+    await expect(
+      provider.synthesize({
+        text: "OpenClaw test",
+        cfg: {} as never,
+        providerConfig: { apiKey: "vydra-test-key" },
+        target: "audio-file",
+        timeoutMs: 30_000,
+      }),
+    ).rejects.toThrow("Vydra speech synthesis: JSON response exceeds 16777216 bytes");
+  });
 });
diff --git a/extensions/vydra/speech-provider.ts b/extensions/vydra/speech-provider.ts
index 74e02e0c91a0..3a2b6daefece 100644
--- a/extensions/vydra/speech-provider.ts
+++ b/extensions/vydra/speech-provider.ts
@@ -2,6 +2,7 @@
 import {
   assertOkOrThrowHttpError,
   postJsonRequest,
+  readProviderJsonResponse,
   resolveProviderHttpRequestConfig,
 } from "openclaw/plugin-sdk/provider-http";
 import { normalizeResolvedSecretInputString } from "openclaw/plugin-sdk/secret-input";
@@ -129,7 +130,7 @@ export function buildVydraSpeechProvider(): SpeechProviderPlugin {
 
       try {
         await assertOkOrThrowHttpError(response, "Vydra speech synthesis failed");
-        const payload = await response.json();
+        const payload = await readProviderJsonResponse<unknown>(response, "Vydra speech synthesis");
         const audioUrl = extractVydraResultUrls(payload, "audio")[0];
         if (!audioUrl) {
           throw new Error("Vydra speech synthesis response missing audio URL");
diff --git a/extensions/vydra/video-generation-provider.test.ts b/extensions/vydra/video-generation-provider.test.ts
index c748bee5ccda..c66f1156a6a2 100644
--- a/extensions/vydra/video-generation-provider.test.ts
+++ b/extensions/vydra/video-generation-provider.test.ts
@@ -18,6 +18,13 @@ function fetchCall(fetchMock: ReturnType<typeof vi.fn>, index: number) {
   return call;
 }
 
+function oversizedJsonResponse(): Response {
+  return new Response(Buffer.alloc(16 * 1024 * 1024 + 1, 0x20), {
+    status: 200,
+    headers: { "Content-Type": "application/json" },
+  });
+}
+
 describe("vydra video-generation provider", () => {
   installPinnedHostnameTestHooks();
 
@@ -96,6 +103,21 @@ describe("vydra video-generation provider", () => {
     ).rejects.toThrow("Vydra video download exceeds 1 bytes");
   });
 
+  it("rejects video creation JSON responses that exceed the provider cap", async () => {
+    stubVydraApiKey();
+    stubFetch(oversizedJsonResponse());
+
+    const provider = buildVydraVideoGenerationProvider();
+    await expect(
+      provider.generateVideo({
+        provider: "vydra",
+        model: "veo3",
+        prompt: "tiny city at sunrise",
+        cfg: {},
+      }),
+    ).rejects.toThrow("Vydra video generation: JSON response exceeds 16777216 bytes");
+  });
+
   it("requires a remote image url for kling", async () => {
     stubVydraApiKey();
     vi.stubGlobal("fetch", vi.fn());
diff --git a/extensions/vydra/video-generation-provider.ts b/extensions/vydra/video-generation-provider.ts
index 7e8e95816d54..02310b558b0a 100644
--- a/extensions/vydra/video-generation-provider.ts
+++ b/extensions/vydra/video-generation-provider.ts
@@ -5,6 +5,7 @@ import {
   createProviderOperationDeadline,
   createProviderOperationTimeoutResolver,
   postJsonRequest,
+  readProviderJsonResponse,
   resolveProviderOperationTimeoutMs,
 } from "openclaw/plugin-sdk/provider-http";
 import type { VideoGenerationProvider } from "openclaw/plugin-sdk/video-generation";
@@ -111,7 +112,10 @@ export function buildVydraVideoGenerationProvider(): VideoGenerationProvider {
 
       try {
         await assertOkOrThrowHttpError(response, "Vydra video generation failed");
-        const submitted = await response.json();
+        const submitted = await readProviderJsonResponse<unknown>(
+          response,
+          "Vydra video generation",
+        );
         const completedPayload = await resolveCompletedVydraPayload({
           submitted,
           baseUrl,