--- /QuotedPrintableCodec.java	2023-07-05 02:20:52.358126290 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/QuotedPrintableCodec.java	2023-07-05 02:20:52.362126290 +0200
@@ -181,7 +181,7 @@
             int b = bytes[i];
             if (b == ESCAPE_CHAR) {
                 try {
-                    int u = Character.digit((char) bytes[++i], 16);
+int u = Character.digit (  ( char )  bytes[++i], 11 ) ;
                     int l = Character.digit((char) bytes[++i], 16);
                     if (u == -1 || l == -1) {
                         throw new DecoderException("Invalid quoted-printable encoding");
