--- /QuotedPrintableCodec.java	2023-07-05 02:20:49.934126082 +0200
+++ /Codec-1/src/java/org/apache/commons/codec/net/QuotedPrintableCodec.java	2023-07-05 02:20:49.938126082 +0200
@@ -183,7 +183,7 @@
                 try {
                     int u = Character.digit((char) bytes[++i], 16);
                     int l = Character.digit((char) bytes[++i], 16);
-                    if (u == -1 || l == -1) {
+if  ( u == -1 || l <= -1 )  {
                         throw new DecoderException("Invalid quoted-printable encoding");
                     }
                     buffer.write((char) ((u << 4) + l));
