From de48af76d47ee78cec7a71db62f00541f02d4d81 Mon Sep 17 00:00:00 2001
From: calixteman <calixte.denizet@gmail.com>
Date: Sun, 22 Mar 2026 14:41:47 +0100
Subject: [PATCH] Interpret empty annotation border as [0, 0, 0]

It fixes #20914.
---
 src/core/annotation.js        | 18 +++++++++++-------
 test/pdfs/issue20914.pdf.link |  1 +
 test/test_manifest.json       |  8 ++++++++
 3 files changed, 20 insertions(+), 7 deletions(-)
 create mode 100644 test/pdfs/issue20914.pdf.link

diff --git a/src/core/annotation.js b/src/core/annotation.js
index bc31efeff..b659fd1f5 100644
--- a/src/core/annotation.js
+++ b/src/core/annotation.js
@@ -1104,14 +1104,18 @@ class Annotation {
       }
     } else if (borderStyle.has("Border")) {
       const array = borderStyle.getArray("Border");
-      if (Array.isArray(array) && array.length >= 3) {
-        this.borderStyle.setHorizontalCornerRadius(array[0]);
-        this.borderStyle.setVerticalCornerRadius(array[1]);
-        this.borderStyle.setWidth(array[2], this.rectangle);
+      if (Array.isArray(array)) {
+        if (array.length >= 3) {
+          this.borderStyle.setHorizontalCornerRadius(array[0]);
+          this.borderStyle.setVerticalCornerRadius(array[1]);
+          this.borderStyle.setWidth(array[2], this.rectangle);
 
-        if (array.length === 4) {
-          // Dash array available
-          this.borderStyle.setDashArray(array[3], /* forceStyle = */ true);
+          if (array.length === 4) {
+            // Dash array available
+            this.borderStyle.setDashArray(array[3], /* forceStyle = */ true);
+          }
+        } else if (array.length === 0) {
+          this.borderStyle.setWidth(0);
         }
       }
     } else {
diff --git a/test/pdfs/issue20914.pdf.link b/test/pdfs/issue20914.pdf.link
new file mode 100644
index 000000000..913f90ffc
--- /dev/null
+++ b/test/pdfs/issue20914.pdf.link
@@ -0,0 +1 @@
+https://github.com/user-attachments/files/26097319/SiemensTest.PDF
diff --git a/test/test_manifest.json b/test/test_manifest.json
index c86559d01..6a5cc4e10 100644
--- a/test/test_manifest.json
+++ b/test/test_manifest.json
@@ -14020,5 +14020,13 @@
     "rounds": 1,
     "link": true,
     "type": "eq"
+  },
+  {
+    "id": "issue20914",
+    "file": "pdfs/issue20914.pdf",
+    "md5": "5740b4600e40c6fc920d38f96a74c6a5",
+    "rounds": 1,
+    "link": true,
+    "type": "eq"
   }
 ]