diff --git a/CHANGELOG.md b/CHANGELOG.md
index 433ca60802e..b100a280818 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Security/Native images: enforce `tools.fs.workspaceOnly` for native prompt image auto-load (including history refs), preventing out-of-workspace sandbox mounts from being implicitly ingested as vision input.
 - Sessions/Tool-result guard: avoid generating synthetic `toolResult` entries for assistant turns that ended with `stopReason: "aborted"` or `"error"`, preventing orphaned tool-use IDs from triggering downstream API validation errors. (#25429) Thanks @mikaeldiakhate-cell.
 - Usage accounting: parse Moonshot/Kimi `cached_tokens` fields (including `prompt_tokens_details.cached_tokens`) into normalized cache-read usage metrics. (#25436) Thanks @Elarwei001.
 - Doctor/Sandbox: when sandbox mode is enabled but Docker is unavailable, surface a clear actionable warning (including failure impact and remediation) instead of a mild “skip checks” note. (#25438) Thanks @mcaxtr.
diff --git a/SECURITY.md b/SECURITY.md
index 378eceaff91..fe6daa332ca 100644
--- a/SECURITY.md
+++ b/SECURITY.md
@@ -168,7 +168,7 @@ For threat model + hardening guidance (including `openclaw security audit --deep
 ### Tool filesystem hardening
 
 - `tools.exec.applyPatch.workspaceOnly: true` (recommended): keeps `apply_patch` writes/deletes within the configured workspace directory.
-- `tools.fs.workspaceOnly: true` (optional): restricts `read`/`write`/`edit`/`apply_patch` paths to the workspace directory.
+- `tools.fs.workspaceOnly: true` (optional): restricts `read`/`write`/`edit`/`apply_patch` paths and native prompt image auto-load paths to the workspace directory.
 - Avoid setting `tools.exec.applyPatch.workspaceOnly: false` unless you fully trust who can trigger tool execution.
 
 ### Web Interface Safety
diff --git a/docs/gateway/security/index.md b/docs/gateway/security/index.md
index 330555d2ddf..c0d642b0e55 100644
--- a/docs/gateway/security/index.md
+++ b/docs/gateway/security/index.md
@@ -833,7 +833,7 @@ We may add a single `readOnlyMode` flag later to simplify this configuration.
 Additional hardening options:
 
 - `tools.exec.applyPatch.workspaceOnly: true` (default): ensures `apply_patch` cannot write/delete outside the workspace directory even when sandboxing is off. Set to `false` only if you intentionally want `apply_patch` to touch files outside the workspace.
-- `tools.fs.workspaceOnly: true` (optional): restricts `read`/`write`/`edit`/`apply_patch` paths to the workspace directory (useful if you allow absolute paths today and want a single guardrail).
+- `tools.fs.workspaceOnly: true` (optional): restricts `read`/`write`/`edit`/`apply_patch` paths and native prompt image auto-load paths to the workspace directory (useful if you allow absolute paths today and want a single guardrail).
 
 ### 5) Secure baseline (copy/paste)
 
diff --git a/src/agents/pi-embedded-runner/run/attempt.ts b/src/agents/pi-embedded-runner/run/attempt.ts
index 9406afae943..e05a21a5776 100644
--- a/src/agents/pi-embedded-runner/run/attempt.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.ts
@@ -28,7 +28,7 @@ import { resolveUserPath } from "../../../utils.js";
 import { normalizeMessageChannel } from "../../../utils/message-channel.js";
 import { isReasoningTagProvider } from "../../../utils/provider-utils.js";
 import { resolveOpenClawAgentDir } from "../../agent-paths.js";
-import { resolveSessionAgentIds } from "../../agent-scope.js";
+import { resolveAgentConfig, resolveSessionAgentIds } from "../../agent-scope.js";
 import { createAnthropicPayloadLogger } from "../../anthropic-payload-log.js";
 import { makeBootstrapWarn, resolveBootstrapContextForRun } from "../../bootstrap-files.js";
 import { createCacheTrace } from "../../cache-trace.js";
@@ -363,6 +363,9 @@ export async function runEmbeddedAttempt(
       config: params.config,
       agentId: params.agentId,
     });
+    const effectiveFsWorkspaceOnly =
+      (resolveAgentConfig(params.config ?? {}, sessionAgentId)?.tools?.fs?.workspaceOnly ??
+        params.config?.tools?.fs?.workspaceOnly) === true;
     // Check if the model supports native image input
     const modelHasVision = params.model.input?.includes("image") ?? false;
     const toolsRaw = params.disableTools
@@ -1087,6 +1090,7 @@ export async function runEmbeddedAttempt(
             historyMessages: activeSession.messages,
             maxBytes: MAX_IMAGE_BYTES,
             maxDimensionPx: resolveImageSanitizationLimits(params.config).maxDimensionPx,
+            workspaceOnly: effectiveFsWorkspaceOnly,
             // Enforce sandbox path restrictions when sandbox is enabled
             sandbox:
               sandbox?.enabled && sandbox?.fsBridge
diff --git a/src/agents/pi-embedded-runner/run/images.test.ts b/src/agents/pi-embedded-runner/run/images.test.ts
index d19ae3bd899..f9cb846da40 100644
--- a/src/agents/pi-embedded-runner/run/images.test.ts
+++ b/src/agents/pi-embedded-runner/run/images.test.ts
@@ -3,6 +3,7 @@ import os from "node:os";
 import path from "node:path";
 import { describe, expect, it } from "vitest";
 import { createHostSandboxFsBridge } from "../../test-helpers/host-sandbox-fs-bridge.js";
+import { createUnsafeMountedSandbox } from "../../test-helpers/unsafe-mounted-sandbox.js";
 import {
   detectAndLoadPromptImages,
   detectImageReferences,
@@ -275,4 +276,76 @@ describe("detectAndLoadPromptImages", () => {
     expect(result.images).toHaveLength(0);
     expect(result.historyImagesByIndex.size).toBe(0);
   });
+
+  it("blocks prompt image refs outside workspace when sandbox workspaceOnly is enabled", async () => {
+    const stateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-native-image-sandbox-"));
+    const sandboxRoot = path.join(stateDir, "sandbox");
+    const agentRoot = path.join(stateDir, "agent");
+    await fs.mkdir(sandboxRoot, { recursive: true });
+    await fs.mkdir(agentRoot, { recursive: true });
+    const pngB64 =
+      "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/woAAn8B9FD5fHAAAAAASUVORK5CYII=";
+    await fs.writeFile(path.join(agentRoot, "secret.png"), Buffer.from(pngB64, "base64"));
+    const sandbox = createUnsafeMountedSandbox({ sandboxRoot, agentRoot });
+    const bridge = sandbox.fsBridge;
+    if (!bridge) {
+      throw new Error("sandbox fs bridge missing");
+    }
+
+    try {
+      const result = await detectAndLoadPromptImages({
+        prompt: "Inspect /agent/secret.png",
+        workspaceDir: sandboxRoot,
+        model: { input: ["text", "image"] },
+        workspaceOnly: true,
+        sandbox: { root: sandbox.workspaceDir, bridge },
+      });
+
+      expect(result.detectedRefs).toHaveLength(1);
+      expect(result.loadedCount).toBe(0);
+      expect(result.skippedCount).toBe(1);
+      expect(result.images).toHaveLength(0);
+    } finally {
+      await fs.rm(stateDir, { recursive: true, force: true });
+    }
+  });
+
+  it("blocks history image refs outside workspace when sandbox workspaceOnly is enabled", async () => {
+    const stateDir = await fs.mkdtemp(path.join(os.tmpdir(), "openclaw-native-image-sandbox-"));
+    const sandboxRoot = path.join(stateDir, "sandbox");
+    const agentRoot = path.join(stateDir, "agent");
+    await fs.mkdir(sandboxRoot, { recursive: true });
+    await fs.mkdir(agentRoot, { recursive: true });
+    const pngB64 =
+      "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/woAAn8B9FD5fHAAAAAASUVORK5CYII=";
+    await fs.writeFile(path.join(agentRoot, "secret.png"), Buffer.from(pngB64, "base64"));
+    const sandbox = createUnsafeMountedSandbox({ sandboxRoot, agentRoot });
+    const bridge = sandbox.fsBridge;
+    if (!bridge) {
+      throw new Error("sandbox fs bridge missing");
+    }
+
+    try {
+      const result = await detectAndLoadPromptImages({
+        prompt: "No inline image in this turn.",
+        workspaceDir: sandboxRoot,
+        model: { input: ["text", "image"] },
+        workspaceOnly: true,
+        historyMessages: [
+          {
+            role: "user",
+            content: [{ type: "text", text: "Previous image /agent/secret.png" }],
+          },
+        ],
+        sandbox: { root: sandbox.workspaceDir, bridge },
+      });
+
+      expect(result.detectedRefs).toHaveLength(1);
+      expect(result.loadedCount).toBe(0);
+      expect(result.skippedCount).toBe(1);
+      expect(result.historyImagesByIndex.size).toBe(0);
+    } finally {
+      await fs.rm(stateDir, { recursive: true, force: true });
+    }
+  });
 });
diff --git a/src/agents/pi-embedded-runner/run/images.ts b/src/agents/pi-embedded-runner/run/images.ts
index c11f191e4f4..022950659e1 100644
--- a/src/agents/pi-embedded-runner/run/images.ts
+++ b/src/agents/pi-embedded-runner/run/images.ts
@@ -4,6 +4,7 @@ import type { ImageContent } from "@mariozechner/pi-ai";
 import { resolveUserPath } from "../../../utils.js";
 import { loadWebMedia } from "../../../web/media.js";
 import type { ImageSanitizationLimits } from "../../image-sanitization.js";
+import { assertSandboxPath } from "../../sandbox-paths.js";
 import type { SandboxFsBridge } from "../../sandbox/fs-bridge.js";
 import { sanitizeImageBlocks } from "../../tool-images.js";
 import { log } from "../logger.js";
@@ -181,6 +182,7 @@ export async function loadImageFromRef(
   workspaceDir: string,
   options?: {
     maxBytes?: number;
+    workspaceOnly?: boolean;
     sandbox?: { root: string; bridge: SandboxFsBridge };
   },
 ): Promise<ImageContent | null> {
@@ -211,6 +213,14 @@ export async function loadImageFromRef(
       } else if (!path.isAbsolute(targetPath)) {
         targetPath = path.resolve(workspaceDir, targetPath);
       }
+      if (options?.workspaceOnly) {
+        const root = options?.sandbox?.root ?? workspaceDir;
+        await assertSandboxPath({
+          filePath: targetPath,
+          cwd: root,
+          root,
+        });
+      }
     }
 
     // loadWebMedia handles local file paths (including file:// URLs)
@@ -361,6 +371,7 @@ export async function detectAndLoadPromptImages(params: {
   historyMessages?: unknown[];
   maxBytes?: number;
   maxDimensionPx?: number;
+  workspaceOnly?: boolean;
   sandbox?: { root: string; bridge: SandboxFsBridge };
 }): Promise<{
   /** Images for the current prompt (existingImages + detected in current prompt) */
@@ -422,6 +433,7 @@ export async function detectAndLoadPromptImages(params: {
   for (const ref of allRefs) {
     const image = await loadImageFromRef(ref, params.workspaceDir, {
       maxBytes: params.maxBytes,
+      workspaceOnly: params.workspaceOnly,
       sandbox: params.sandbox,
     });
     if (image) {