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/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c

FINAL RESULTS:

data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:70:49:  [4] (shell) system:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
#define xmlCreateIntSubset(doc, name, external, system) \
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:73:6:  [4] (shell) system:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
    (system ? rb_str_new2(system) : Qnil));
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:73:27:  [4] (shell) system:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
    (system ? rb_str_new2(system) : Qnil));
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:142:7:  [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(name, ns);
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:143:7:  [4] (buffer) strcat:
  Does not check for buffer overflows when concatenating to destination
  [MS-banned] (CWE-120). Consider using strcat_s, strncat, strlcat, or
  snprintf (warning: strncat is easily misused).
      strcat(name, attr->name);
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:199:15:  [4] (shell) system:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
      (strlen(system) ? CONST_CAST system : NIL));
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:199:36:  [4] (shell) system:
  This causes a new program to execute and is difficult to use safely
  (CWE-78). try using a library call that implements the same functionality
  if available.
      (strlen(system) ? CONST_CAST system : NIL));
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:98:5:  [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 name[tag.length+1];
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:100:5:  [1] (buffer) strncpy:
  Easily used incorrectly; doesn't always \0-terminate or check for invalid
  pointers [MS-banned] (CWE-120).
    strncpy(name, tag.data, tag.length);
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:132:11:  [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).
      if (strlen(ns) + strlen(attr->name) + 1 > namelen) {
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:132:24:  [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).
      if (strlen(ns) + strlen(attr->name) + 1 > namelen) {
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:138:19:  [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).
        namelen = strlen(ns) + strlen(attr->name) + 1;
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:138:32:  [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).
        namelen = strlen(ns) + strlen(attr->name) + 1;
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:198:8:  [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).
      (strlen(public) ? CONST_CAST public : NIL),
data/ruby-nokogumbo-1.4.2+ds/ext/nokogumboc/nokogumbo.c:199:8:  [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).
      (strlen(system) ? CONST_CAST system : NIL));

ANALYSIS SUMMARY:

Hits = 15
Lines analyzed = 236 in approximately 0.02 seconds (14225 lines/second)
Physical Source Lines of Code (SLOC) = 170
Hits@level = [0]   0 [1]   7 [2]   1 [3]   0 [4]   7 [5]   0
Hits@level+ = [0+]  15 [1+]  15 [2+]   8 [3+]   7 [4+]   7 [5+]   0
Hits/KSLOC@level+ = [0+] 88.2353 [1+] 88.2353 [2+] 47.0588 [3+] 41.1765 [4+] 41.1765 [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.