CVE WatchOct 14, 2026

CVE-2021-3177

Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Pyth

CVSS

9.8

Critical

EPSS

24.2%

p98

KEV

—

Exploit Today

0-100

Published: Jan 19, 2021 · Last modified: Oct 14, 2026 · CWE-120

EPSS · 30d

23.3%EPSS · 30 days24.2%

2026-09-242026-10-23

Technical description

Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Python applications that accept floating-point numbers as untrusted input, as demonstrated by a 1e300 argument to c_double.from_param. This occurs because sprintf is used unsafely.

Official references

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