diff --git a/scripts/github/dependency-guard.mjs b/scripts/github/dependency-guard.mjs
index 44aad78523d..97f046208dd 100644
--- a/scripts/github/dependency-guard.mjs
+++ b/scripts/github/dependency-guard.mjs
@@ -11,6 +11,7 @@ export const dependencyGraphGuardMarker = "<!-- openclaw:dependency-graph-guard
 export const dependencyChangedLabel = "dependencies-changed";
 export const allowDependenciesCommand = "/allow-dependencies-change";
 export const GITHUB_ERROR_BODY_MAX_BYTES = 64 * 1024;
+export const GITHUB_RESPONSE_BODY_MAX_BYTES = 4 * 1024 * 1024;
 export const GITHUB_API_REQUEST_TIMEOUT_MS = 30_000;
 
 const maxListedFiles = 25;
@@ -489,12 +490,33 @@ function githubErrorBodyTooLarge(maxBytes) {
   return new Error(`GitHub error response body exceeded ${maxBytes} bytes`);
 }
 
-export async function readBoundedGitHubErrorText(response, maxBytes = GITHUB_ERROR_BODY_MAX_BYTES) {
+function githubResponseBodyTooLarge(maxBytes) {
+  return new Error(`GitHub response body exceeded ${maxBytes} bytes`);
+}
+
+export async function readBoundedGitHubErrorText(
+  response,
+  maxBytes = GITHUB_ERROR_BODY_MAX_BYTES,
+  options = {},
+) {
   return await readBoundedResponseText(response, "GitHub error", maxBytes, {
     createTooLargeError: () => githubErrorBodyTooLarge(maxBytes),
+    ...options,
   });
 }
 
+export async function readBoundedGitHubJson(
+  response,
+  maxBytes = GITHUB_RESPONSE_BODY_MAX_BYTES,
+  options = {},
+) {
+  const text = await readBoundedResponseText(response, "GitHub", maxBytes, {
+    createTooLargeError: () => githubResponseBodyTooLarge(maxBytes),
+    ...options,
+  });
+  return JSON.parse(text);
+}
+
 function timeoutError(path, method, timeoutMs) {
   return new Error(`GitHub API ${method} ${path} exceeded timeout ${timeoutMs}ms`);
 }
@@ -513,6 +535,7 @@ function combineAbortSignals(signals) {
 export function githubApi(token, options = {}) {
   const fetchImpl = options.fetchImpl ?? fetch;
   const timeoutMs = options.timeoutMs ?? GITHUB_API_REQUEST_TIMEOUT_MS;
+  const responseMaxBodyBytes = options.responseMaxBodyBytes ?? GITHUB_RESPONSE_BODY_MAX_BYTES;
   const baseHeaders = {
     accept: "application/vnd.github+json",
     authorization: `Bearer ${token}`,
@@ -542,7 +565,10 @@ export function githubApi(token, options = {}) {
       if (!response.ok) {
         let errorText;
         try {
-          errorText = await readBoundedGitHubErrorText(response);
+          errorText = await readBoundedGitHubErrorText(response, GITHUB_ERROR_BODY_MAX_BYTES, {
+            signal: timeoutController.signal,
+            timeoutPromise,
+          });
         } catch (bodyError) {
           errorText = bodyError instanceof Error ? bodyError.message : String(bodyError);
         }
@@ -550,7 +576,10 @@ export function githubApi(token, options = {}) {
         error.status = response.status;
         throw error;
       }
-      return response.json();
+      return await readBoundedGitHubJson(response, responseMaxBodyBytes, {
+        signal: timeoutController.signal,
+        timeoutPromise,
+      });
     })();
     operationPromise.catch(() => {});
     try {
diff --git a/scripts/github/security-sensitive-guard.mjs b/scripts/github/security-sensitive-guard.mjs
index 0f8bc90ad82..ff75d07e9ba 100644
--- a/scripts/github/security-sensitive-guard.mjs
+++ b/scripts/github/security-sensitive-guard.mjs
@@ -10,6 +10,7 @@ export const securitySensitiveGuardMarker = "<!-- openclaw:security-sensitive-gu
 export const securitySensitiveChangedLabel = "security-sensitive-changed";
 export const allowSecuritySensitiveCommand = "/allow-security-sensitive-change";
 export const GITHUB_ERROR_BODY_MAX_BYTES = 64 * 1024;
+export const GITHUB_RESPONSE_BODY_MAX_BYTES = 4 * 1024 * 1024;
 export const GITHUB_API_REQUEST_TIMEOUT_MS = 30_000;
 
 const securityTeamSlug = process.env.OPENCLAW_SECURITY_TEAM_SLUG ?? "openclaw-secops";
@@ -349,12 +350,33 @@ function githubErrorBodyTooLarge(maxBytes) {
   return new Error(`GitHub error response body exceeded ${maxBytes} bytes`);
 }
 
-export async function readBoundedGitHubErrorText(response, maxBytes = GITHUB_ERROR_BODY_MAX_BYTES) {
+function githubResponseBodyTooLarge(maxBytes) {
+  return new Error(`GitHub response body exceeded ${maxBytes} bytes`);
+}
+
+export async function readBoundedGitHubErrorText(
+  response,
+  maxBytes = GITHUB_ERROR_BODY_MAX_BYTES,
+  options = {},
+) {
   return await readBoundedResponseText(response, "GitHub error", maxBytes, {
     createTooLargeError: () => githubErrorBodyTooLarge(maxBytes),
+    ...options,
   });
 }
 
+export async function readBoundedGitHubJson(
+  response,
+  maxBytes = GITHUB_RESPONSE_BODY_MAX_BYTES,
+  options = {},
+) {
+  const text = await readBoundedResponseText(response, "GitHub", maxBytes, {
+    createTooLargeError: () => githubResponseBodyTooLarge(maxBytes),
+    ...options,
+  });
+  return JSON.parse(text);
+}
+
 function timeoutError(path, method, timeoutMs) {
   return new Error(`GitHub API ${method} ${path} exceeded timeout ${timeoutMs}ms`);
 }
@@ -373,6 +395,7 @@ function combineAbortSignals(signals) {
 export function githubApi(token, options = {}) {
   const fetchImpl = options.fetchImpl ?? fetch;
   const timeoutMs = options.timeoutMs ?? GITHUB_API_REQUEST_TIMEOUT_MS;
+  const responseMaxBodyBytes = options.responseMaxBodyBytes ?? GITHUB_RESPONSE_BODY_MAX_BYTES;
   const baseHeaders = {
     accept: "application/vnd.github+json",
     authorization: `Bearer ${token}`,
@@ -402,7 +425,10 @@ export function githubApi(token, options = {}) {
       if (!response.ok) {
         let errorText;
         try {
-          errorText = await readBoundedGitHubErrorText(response);
+          errorText = await readBoundedGitHubErrorText(response, GITHUB_ERROR_BODY_MAX_BYTES, {
+            signal: timeoutController.signal,
+            timeoutPromise,
+          });
         } catch (bodyError) {
           errorText = bodyError instanceof Error ? bodyError.message : String(bodyError);
         }
@@ -410,7 +436,10 @@ export function githubApi(token, options = {}) {
         error.status = response.status;
         throw error;
       }
-      return response.json();
+      return await readBoundedGitHubJson(response, responseMaxBodyBytes, {
+        signal: timeoutController.signal,
+        timeoutPromise,
+      });
     })();
     operationPromise.catch(() => {});
     try {
diff --git a/test/scripts/dependency-guard-script.test.ts b/test/scripts/dependency-guard-script.test.ts
index 46b069640b2..0788520e60a 100644
--- a/test/scripts/dependency-guard-script.test.ts
+++ b/test/scripts/dependency-guard-script.test.ts
@@ -2,6 +2,7 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
 import {
   GITHUB_ERROR_BODY_MAX_BYTES,
+  GITHUB_RESPONSE_BODY_MAX_BYTES,
   canAutoscrubPullRequest,
   createAutoscrubCommit,
   dependencyGuardCommentAuthors,
@@ -669,6 +670,21 @@ describe("dependency guard script", () => {
     }
   });
 
+  it("bounds successful GitHub API response bodies", async () => {
+    const request = githubApi("token", {
+      responseMaxBodyBytes: 64,
+      fetchImpl: (() =>
+        Promise.resolve(
+          new Response("x".repeat(65), {
+            headers: { "content-length": "65" },
+          }),
+        )) as typeof fetch,
+    }).request("/repos/openclaw/openclaw");
+
+    await expect(request).rejects.toThrow("GitHub response body exceeded 64 bytes");
+    expect(GITHUB_RESPONSE_BODY_MAX_BYTES).toBeGreaterThan(64);
+  });
+
   it("aborts stalled GitHub API fetches at the request timeout", async () => {
     let signal: AbortSignal | undefined;
     let markFetchStarted!: () => void;
diff --git a/test/scripts/security-sensitive-guard-script.test.ts b/test/scripts/security-sensitive-guard-script.test.ts
index 5bb90a42355..0aed491ae78 100644
--- a/test/scripts/security-sensitive-guard-script.test.ts
+++ b/test/scripts/security-sensitive-guard-script.test.ts
@@ -1,11 +1,13 @@
 // Security Sensitive Guard Script tests cover sensitive file guard behavior.
 import { describe, expect, it } from "vitest";
 import {
+  GITHUB_RESPONSE_BODY_MAX_BYTES,
   allowSecuritySensitiveCommand,
   collectSecuritySensitiveChanges,
   findSecuritySensitiveOverrideCommand,
   findSecuritySensitiveOverrideCommandAsync,
   findTrustedSecuritySensitiveGuardActor,
+  githubApi,
   isSecuritySensitiveFile,
   isSecuritySensitiveGuardAuthorizedForHead,
   isSecuritySensitiveGuardMarkerComment,
@@ -245,4 +247,19 @@ describe("security-sensitive guard script", () => {
       new Set(["vincentkoc", "steipete", "joshavant"]),
     );
   });
+
+  it("bounds successful GitHub API response bodies", async () => {
+    const request = githubApi("token", {
+      responseMaxBodyBytes: 64,
+      fetchImpl: (() =>
+        Promise.resolve(
+          new Response("x".repeat(65), {
+            headers: { "content-length": "65" },
+          }),
+        )) as typeof fetch,
+    }).request("/repos/openclaw/openclaw");
+
+    await expect(request).rejects.toThrow("GitHub response body exceeded 64 bytes");
+    expect(GITHUB_RESPONSE_BODY_MAX_BYTES).toBeGreaterThan(64);
+  });
 });