PatchGap
Chrome · Paint

CVE-2026-78895

Logic Error in Paint
High chrome Logic Error 🔧 Commit mapped

Overview

High
Severity
—
CVSS
No
Exploited ITW
Fixed
Fix Status
ImpactInformation leak in Paint
DescriptionInformation leak in Paint
ComponentPaint
Bug ClassLogic Error
Tracker532914190
Fix commit3c3b9747e9c2 (chromium/src) +240/-7
CISA KEVNot listed
CreditedGoogle
Disclosed2026-08-25

Changed Functions

FunctionChangeNotes
promise_test
third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
 modified
promise_test
third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html
 modified
promise_test
third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html
 modified
promise_test
third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html
 modified

Files Changed

  • third_party/blink/renderer/core/html/html_frame_owner_element.cc
  • third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
  • third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html
  • third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html
  • third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html

Patch

view commit
From 3c3b9747e9c2926b5560a959622eb44e7f01e91a Mon Sep 17 00:00:00 2001
From: Stephen Chenney <[email protected]>
Date: Sun, 02 Aug 2026 16:13:12 -0700
Subject: [PATCH] [HiC] Invalidate body background images in iframes

When a iframe with a background image specified for the body (or
html) is moved into a canvas subtree, the image is not invalidated
and a cross-origin image may still be painted into the canvas. Fix
this by invalidating the display item clients associated with the
root background.

Bug: 532914190
Change-Id: I982af5f176d648472f8453e911cd4c32588c5f2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/8181706
Commit-Queue: Stephen Chenney <[email protected]>
Reviewed-by: Philip Rogers <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1672440}
---

diff --git a/third_party/blink/renderer/core/html/html_frame_owner_element.cc b/third_party/blink/renderer/core/html/html_frame_owner_element.cc
index df57be00..eb18037 100644
--- a/third_party/blink/renderer/core/html/html_frame_owner_element.cc
+++ b/third_party/blink/renderer/core/html/html_frame_owner_element.cc
@@ -58,6 +58,7 @@
 #include "third_party/blink/renderer/core/html/loading_attribute.h"
 #include "third_party/blink/renderer/core/html_names.h"
 #include "third_party/blink/renderer/core/layout/layout_embedded_content.h"
+#include "third_party/blink/renderer/core/layout/layout_view.h"
 #include "third_party/blink/renderer/core/loader/document_loader.h"
 #include "third_party/blink/renderer/core/loader/frame_load_request.h"
 #include "third_party/blink/renderer/core/loader/frame_loader.h"
@@ -65,6 +66,7 @@
 #include "third_party/blink/renderer/core/loader/url_matcher.h"
 #include "third_party/blink/renderer/core/page/page.h"
 #include "third_party/blink/renderer/core/page/scrolling/root_scroller_controller.h"
+#include "third_party/blink/renderer/core/paint/object_paint_invalidator.h"
 #include "third_party/blink/renderer/core/paint/paint_layer.h"
 #include "third_party/blink/renderer/core/style/computed_style.h"
 #include "third_party/blink/renderer/core/timing/dom_window_performance.h"
@@ -244,6 +246,21 @@
   if (Document* inner_document = contentDocument()) {
     if (Element* root = inner_document->documentElement()) {
       root->SetIsInCanvasSubtree(IsInCanvasSubtree());
+      if (auto* layout_view = inner_document->GetLayoutView()) {
+        layout_view->SetNeedsPaintPropertyUpdate();
+        layout_view->Layer()->SetNeedsRepaint();
+        // At this point we do not know if the layout view background etc.
+        // will be painted by the layout view itself or the scrollable area.
+        // So invalidate both display item clients.
+        ObjectPaintInvalidator(*layout_view)
+            .InvalidateDisplayItemClient(
+                *layout_view, PaintInvalidationReason::kUncacheable);
+        ObjectPaintInvalidator(*layout_view)
+            .InvalidateDisplayItemClient(
+                layout_view->GetScrollableArea()
+                    ->GetScrollingBackgroundDisplayItemClient(),
+                PaintInvalidationReason::kUncacheable);
+      }
     }
   }
 }
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
index 5dc64d5..8558f9f 100644
--- a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
@@ -9,20 +9,16 @@
 </head>
 
 <body>
-  <iframe id="iframe" src="support/subframe-cross-origin-background-image.https.sub.html"></iframe>
   <canvas id="canvas" width="300" height="150" layoutsubtree>
-    <div id="child"></div>
+    <div id="child">
+      <iframe id="iframe" src="support/subframe-cross-origin-background-image.https.sub.html"></iframe>
+    </div>
   </canvas>
 
   <script>
   window.onload = () => {
     promise_test(async function(t) {
       await waitForCanvasPaint(canvas);
-
-      // Atomically move the iframe into the canvas.
-      child.moveBefore(iframe, null);
-
-      await waitForCanvasPaint(canvas);
       const context = canvas.getContext("2d");
       context.drawElementImage(child, 0, 0);
       const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..0c97599
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images when moved under canvas</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <iframe id="iframe" src="support/subframe-cross-origin-background-image.https.sub.html"></iframe>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child"></div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+
+      // Atomically move the iframe into the canvas.
+      child.moveBefore(iframe, null);
+
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..10c95a6c
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images on the body</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child">
+      <iframe id="iframe" src="support/subframe-cross-origin-background-image-on-body.https.sub.html"></iframe>
+    </div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..6ea6f56
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images on the body when moved under canvas</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <iframe id="iframe" src="support/subframe-cross-origin-background-image-on-body.https.sub.html"></iframe>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child"></div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+
+      // Atomically move the iframe into the canvas.
+      child.moveBefore(iframe, null);
+
+      await waitForCanvasPaint(canvas);
Loading diff…

Regression Test / PoC

shipped with the fix
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
index 5dc64d5..8558f9f 100644
--- a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-ignored.tentative.https.sub.html
@@ -9,20 +9,16 @@
 </head>
 
 <body>
-  <iframe id="iframe" src="support/subframe-cross-origin-background-image.https.sub.html"></iframe>
   <canvas id="canvas" width="300" height="150" layoutsubtree>
-    <div id="child"></div>
+    <div id="child">
+      <iframe id="iframe" src="support/subframe-cross-origin-background-image.https.sub.html"></iframe>
+    </div>
   </canvas>
 
   <script>
   window.onload = () => {
     promise_test(async function(t) {
       await waitForCanvasPaint(canvas);
-
-      // Atomically move the iframe into the canvas.
-      child.moveBefore(iframe, null);
-
-      await waitForCanvasPaint(canvas);
       const context = canvas.getContext("2d");
       context.drawElementImage(child, 0, 0);
       const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..0c97599
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-in-iframe-moved-ignored.tentative.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images when moved under canvas</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <iframe id="iframe" src="support/subframe-cross-origin-background-image.https.sub.html"></iframe>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child"></div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+
+      // Atomically move the iframe into the canvas.
+      child.moveBefore(iframe, null);
+
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..10c95a6c
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-ignored.tentative.https.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images on the body</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child">
+      <iframe id="iframe" src="support/subframe-cross-origin-background-image-on-body.https.sub.html"></iframe>
+    </div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..6ea6f56
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-body-in-iframe-moved-ignored.tentative.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images on the body when moved under canvas</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <iframe id="iframe" src="support/subframe-cross-origin-background-image-on-body.https.sub.html"></iframe>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child"></div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+
+      // Atomically move the iframe into the canvas.
+      child.moveBefore(iframe, null);
+
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-html-in-iframe-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-html-in-iframe-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..eda61db
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-html-in-iframe-ignored.tentative.https.sub.html
@@ -0,0 +1,32 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images on the body</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child">
+      <iframe id="iframe" src="support/subframe-cross-origin-background-image-on-html.https.sub.html"></iframe>
+    </div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-html-in-iframe-moved-ignored.tentative.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-html-in-iframe-moved-ignored.tentative.https.sub.html
new file mode 100644
index 0000000..27e79063
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/background-image-on-html-in-iframe-moved-ignored.tentative.https.sub.html
@@ -0,0 +1,36 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>drawElementImage does not draw cross-origin background images on the body</title>
+  <script src='/resources/testharness.js'></script>
+  <script src='/resources/testharnessreport.js'></script>
+  <script src='/html/canvas/resources/canvas-tests.js'></script>
+  <script src="/html/canvas/resources/wait-for-canvas-paint.js"></script>
+</head>
+
+<body>
+  <iframe id="iframe" src="support/subframe-cross-origin-background-image-on-html.https.sub.html"></iframe>
+  <canvas id="canvas" width="300" height="150" layoutsubtree>
+    <div id="child"></div>
+  </canvas>
+
+  <script>
+  window.onload = () => {
+    promise_test(async function(t) {
+      await waitForCanvasPaint(canvas);
+
+      // Atomically move the iframe into the canvas.
+      child.moveBefore(iframe, null);
+
+      await waitForCanvasPaint(canvas);
+      const context = canvas.getContext("2d");
+      context.drawElementImage(child, 0, 0);
+      const imgData = context.getImageData(0, 0, canvas.width, canvas.height);
+      let pixel = _getPixelFromImageData(imgData, 50, 50);
+      assert_array_equals(pixel, [0, 128, 0, 255],
+                          "Cross-origin background image in iframe should not draw");
+    });
+  };
+  </script>
+</body>
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/support/subframe-cross-origin-background-image-on-body.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/support/subframe-cross-origin-background-image-on-body.https.sub.html
new file mode 100644
index 0000000..377692a
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/support/subframe-cross-origin-background-image-on-body.https.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>subframe with cross-origin background image on the body</title>
+  <style>
+  body {
+    background-image: url("https://{{hosts[alt][www]}}:{{ports[https][0]}}/images/red-100x100.png");
+    background-repeat: repeat-x repeat-y;
+    background-color: rgb(0 128 0);
+  }
+  div {
+    position: absolute;
+    left: 0px;
+    top: 0px;
+    width: 100px;
+    height: 100px;
+    background: transparent;
+  }
+  </style>
+</head>
+
+<body><div></div></body>
+
+</html>
diff --git a/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/support/subframe-cross-origin-background-image-on-html.https.sub.html b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/support/subframe-cross-origin-background-image-on-html.https.sub.html
new file mode 100644
index 0000000..cf24f02
--- /dev/null
+++ b/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/draw-element-image/privacy/support/subframe-cross-origin-background-image-on-html.https.sub.html
@@ -0,0 +1,24 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>subframe with cross-origin background image on the html element</title>
+  <style>
+  html {
+    background-image: url("https://{{hosts[alt][www]}}:{{ports[https][0]}}/images/red-100x100.png");
+    background-repeat: repeat-x repeat-y;
+    background-color: rgb(0 128 0);
+  }
+  div {
+    position: absolute;
+    left: 0px;
+    top: 0px;
+    width: 100px;
+    height: 100px;
+    background: transparent;
+  }
+  </style>
+</head>
+
+<body><div></div></body>
+
+</html>
Loading diff…

Original Bug Report

The reporter's bug is still restricted on the tracker. Chrome de-restricts security bugs ~30–90 days after the fix ships; a later run will backfill it here.
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