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PoC is attached.
Version: 2.7.12
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=わ=わ4461==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6250000078ff at pc 0x000000508e70 bp 0x7ffe3e88db60 sp 0x7ffe3e88db58
READ of size 1 at 0x6250000078ff thread T0
 #0 0x508e6f in tok_nextc /home/mtowalski/tmp/python/Python-2.7.12/Parser/tokenizer.c:954:28
 #1 0x4ff581 in tok_get /home/mtowalski/tmp/python/Python-2.7.12/Parser/tokenizer.c:1232:17
 #2 0x4ff581 in PyTokenizer_Get /home/mtowalski/tmp/python/Python-2.7.12/Parser/tokenizer.c:1681:0
 #3 0x4fae5d in parsetok /home/mtowalski/tmp/python/Python-2.7.12/Parser/parsetok.c:159:16
 #4 0x7c9a92 in PyParser_ASTFromFile /home/mtowalski/tmp/python/Python-2.7.12/Python/pythonrun.c:1499:15
 #5 0x7c9e49 in PyRun_FileExFlags /home/mtowalski/tmp/python/Python-2.7.12/Python/pythonrun.c:1354:11
 #6 0x7c8a7e in PyRun_SimpleFileExFlags /home/mtowalski/tmp/python/Python-2.7.12/Python/pythonrun.c:948:13
 #7 0x4f80b9 in Py_Main /home/mtowalski/tmp/python/Python-2.7.12/Modules/main.c:640:23
 #8 0x7feaeb493f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287:0
 #9 0x42adc5 in _start ??:?
0x6250000078ff is located 1 bytes to the left of 8192-byte region [0x625000007900,0x625000009900)
allocated by thread T0 here:
 #0 0x4c8d3c in malloc ??:?
 #1 0x4fe75d in PyTokenizer_FromFile /home/mtowalski/tmp/python/Python-2.7.12/Parser/tokenizer.c:759:29
SUMMARY: AddressSanitizer: heap-buffer-overflow (/home/mtowalski/tmp/python/Python-2.7.12/python+0x508e6f)
Shadow bytes around the buggy address:
 0x0c4a7fff8ec0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
 0x0c4a7fff8ed0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
 0x0c4a7fff8ee0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
 0x0c4a7fff8ef0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
 0x0c4a7fff8f00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c4a7fff8f10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
 0x0c4a7fff8f20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 0x0c4a7fff8f30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 0x0c4a7fff8f40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 0x0c4a7fff8f50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 0x0c4a7fff8f60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
 Addressable: 00
 Partially addressable: 01 02 03 04 05 06 07
 Heap left redzone: fa
 Heap right redzone: fb
 Freed heap region: fd
 Stack left redzone: f1
 Stack mid redzone: f2
 Stack right redzone: f3
 Stack partial redzone: f4
 Stack after return: f5
 Stack use after scope: f8
 Global redzone: f9
 Global init order: f6
 Poisoned by user: f7
 Container overflow: fc
 Array cookie: ac
 Intra object redzone: bb
 ASan internal: fe
 Left alloca redzone: ca
 Right alloca redzone: cb
==4461==ABORTING