Update lib/buffer.js

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
nodejs · Oct 8, 2022 · c8edb80 · c8edb80
1 parent 156937f
commit c8edb80
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/lib/buffer.js b/lib/buffer.js
@@ -1283,6 +1283,9 @@ function atob(input) {
       if (index === kForgivingBase64AllowedChars.length - 1) {
         // The last element of `kForgivingBase64AllowedChars` is the `=`
         equalCharCount++;
+      } else if (equalCharCount) {
+        // Only one more `=` is permitted after the first equal sign.
+        throw lazyDOMException('Invalid character', 'InvalidCharacterError');
       }
     } else if (index === -1) {
       throw lazyDOMException('Invalid character', 'InvalidCharacterError');