diff --git a/src/core/image.js b/src/core/image.js
index 454671fa0..b84a6d51f 100644
--- a/src/core/image.js
+++ b/src/core/image.js
@@ -140,11 +140,26 @@ class PDFImage {
       );
       width = image.width;
       height = image.height;
-    }
-    if (width < 1 || height < 1) {
-      throw new FormatError(
-        `Invalid image width: ${width} or height: ${height}`
-      );
+    } else {
+      const validWidth = typeof width === "number" && width > 0,
+        validHeight = typeof height === "number" && height > 0;
+
+      if (!validWidth || !validHeight) {
+        if (!image.fallbackDims) {
+          throw new FormatError(
+            `Invalid image width: ${width} or height: ${height}`
+          );
+        }
+        warn(
+          "PDFImage - using the Width/Height of the parent image, for SMask/Mask data."
+        );
+        if (!validWidth) {
+          width = image.fallbackDims.width;
+        }
+        if (!validHeight) {
+          height = image.fallbackDims.height;
+        }
+      }
     }
     this.width = width;
     this.height = height;
@@ -244,6 +259,10 @@ class PDFImage {
     }
 
     if (smask) {
+      // Provide fallback width/height values for corrupt SMask images
+      // (see issue19611.pdf).
+      smask.fallbackDims ??= { width, height };
+
       this.smask = new PDFImage({
         xref,
         res,
@@ -260,6 +279,10 @@ class PDFImage {
         if (!imageMask) {
           warn("Ignoring /Mask in image without /ImageMask.");
         } else {
+          // Provide fallback width/height values for corrupt Mask images
+          // (see issue19611.pdf).
+          mask.fallbackDims ??= { width, height };
+
           this.mask = new PDFImage({
             xref,
             res,
diff --git a/test/pdfs/issue19611.pdf.link b/test/pdfs/issue19611.pdf.link
new file mode 100644
index 000000000..783cb9736
--- /dev/null
+++ b/test/pdfs/issue19611.pdf.link
@@ -0,0 +1 @@
+https://github.com/user-attachments/files/19102190/test.pdf
diff --git a/test/test_manifest.json b/test/test_manifest.json
index 259f8fa04..52e7d8b38 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -3913,6 +3913,14 @@
     "rounds": 1,
     "type": "eq"
   },
+  {
+    "id": "issue19611",
+    "file": "pdfs/issue19611.pdf",
+    "md5": "169dc6df1c43dcb4659b2ddb6a4b39e4",
+    "rounds": 1,
+    "link": true,
+    "type": "eq"
+  },
   {
     "id": "issue1127-text",
     "file": "pdfs/issue1127.pdf",