1 This patch comes from upstream:

     2 

     3 https://bugs.python.org/issue26171

     4 

     5 --- a/Modules/zipimport.c

     6 +++ b/Modules/zipimport.c

     7 @@ -895,6 +895,11 @@ get_data(char *archive, PyObject *toc_en

     8          PyMarshal_ReadShortFromFile(fp);        /* local header size */

     9      file_offset += l;           /* Start of file data */

    10  

    11 +    if (data_size > LONG_MAX - 1) {

    12 +        fclose(fp);

    13 +        PyErr_NoMemory();

    14 +        return NULL;

    15 +    }

    16      raw_data = PyString_FromStringAndSize((char *)NULL, compress == 0 ?

    17                                            data_size : data_size + 1);

    18      if (raw_data == NULL) {