Flawfinder version 2.0.10, (C) 2001-2019 David A. Wheeler.
Number of rules (primarily dangerous function names) in C/C++ ruleset: 223
Examining data/pyyaml-5.3.1/ext/_yaml.c
Examining data/pyyaml-5.3.1/ext/_yaml.h

FINAL RESULTS:

data/pyyaml-5.3.1/ext/_yaml.c:770:5:  [4] (buffer) strcpy:
  Does not check for buffer overflows when copying to destination [MS-banned]
  (CWE-120). Consider using snprintf, strcpy_s, or strlcpy (warning: strncpy
  easily misused).
    strcpy(__PYX_DEFAULT_STRING_ENCODING, default_encoding_c);
data/pyyaml-5.3.1/ext/_yaml.c:27468:18:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
            if (!setstate) PyErr_Clear();
data/pyyaml-5.3.1/ext/_yaml.c:27469:18:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
            if (!setstate || __Pyx_setup_reduce_is_named(setstate, __pyx_n_s_setstate_cython)) {
data/pyyaml-5.3.1/ext/_yaml.c:27469:58:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
            if (!setstate || __Pyx_setup_reduce_is_named(setstate, __pyx_n_s_setstate_cython)) {
data/pyyaml-5.3.1/ext/_yaml.c:27490:16:  [3] (random) setstate:
  This function is not sufficiently random for security-related functions
  such as key and nonce creation (CWE-327). Use a more secure technique for
  acquiring random values.
    Py_XDECREF(setstate);
data/pyyaml-5.3.1/ext/_yaml.c:723:9:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
        char ascii_chars[128];
data/pyyaml-5.3.1/ext/_yaml.c:14550:5:  [2] (buffer) memcpy:
  Does not check for buffer overflows when copying to destination (CWE-120).
  Make sure destination can always hold the source data.
    memcpy(__pyx_v_buffer, (PyString_AS_STRING(__pyx_t_1) + __pyx_v_parser->stream_cache_pos), __pyx_v_size);
data/pyyaml-5.3.1/ext/_yaml.c:28473:5:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
    char ctversion[4], rtversion[4];
data/pyyaml-5.3.1/ext/_yaml.c:28477:9:  [2] (buffer) char:
  Statically-sized arrays can be improperly restricted, leading to potential
  overflows or other issues (CWE-119!/CWE-120). Perform bounds checking, use
  functions that limit length, or ensure that the size is larger than the
  maximum possible length.
        char message[200];
data/pyyaml-5.3.1/ext/_yaml.c:647:87:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
#define __Pyx_PyByteArray_FromString(s) PyByteArray_FromStringAndSize((const char*)s, strlen((const char*)s))
data/pyyaml-5.3.1/ext/_yaml.c:768:52:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    __PYX_DEFAULT_STRING_ENCODING = (char*) malloc(strlen(default_encoding_c) + 1);
data/pyyaml-5.3.1/ext/_yaml.c:28521:65:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
    return __Pyx_PyUnicode_FromStringAndSize(c_str, (Py_ssize_t)strlen(c_str));
data/pyyaml-5.3.1/ext/_yaml.h:6:59:  [1] (buffer) strlen:
  Does not handle strings that are not \0-terminated; if given one it may
  perform an over-read (it could cause a crash if unprotected) (CWE-126).
#define PyUnicode_FromString(s) PyUnicode_DecodeUTF8((s), strlen(s), "strict")

ANALYSIS SUMMARY:

Hits = 13
Lines analyzed = 28766 in approximately 0.87 seconds (33180 lines/second)
Physical Source Lines of Code (SLOC) = 15642
Hits@level = [0]   0 [1]   4 [2]   4 [3]   4 [4]   1 [5]   0
Hits@level+ = [0+]  13 [1+]  13 [2+]   9 [3+]   5 [4+]   1 [5+]   0
Hits/KSLOC@level+ = [0+] 0.831096 [1+] 0.831096 [2+] 0.575374 [3+] 0.319652 [4+] 0.0639304 [5+]   0
Dot directories skipped = 1 (--followdotdir overrides)
Minimum risk level = 1
Not every hit is necessarily a security vulnerability.
There may be other security vulnerabilities; review your code!
See 'Secure Programming HOWTO'
(https://dwheeler.com/secure-programs) for more information.