/ 
perl-5.27.7
⭐ Starred 2013
/ Getopt::Std
Security Advisories (8)
CVE-2020-12723 (2020-06-05)

regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.

CVE-2020-10878 (2020-06-05)

Perl before 5.30.3 has an integer overflow related to mishandling of a "PL_regkind[OP(n)] == NOTHING" situation. A crafted regular expression could lead to malformed bytecode with a possibility of instruction injection.

CVE-2020-10543 (2020-06-05)

Perl before 5.30.3 on 32-bit platforms allows a heap-based buffer overflow because nested regular expression quantifiers have an integer overflow.

CVE-2018-6798 (2018-04-17)

An issue was discovered in Perl 5.22 through 5.26. Matching a crafted locale dependent regular expression can cause a heap-based buffer over-read and potentially information disclosure.

CVE-2023-47100

In Perl before 5.38.2, S_parse_uniprop_string in regcomp.c can write to unallocated space because a property name associated with a \p{...} regular expression construct is mishandled. The earliest affected version is 5.30.0.

CVE-2024-56406 (2025-04-13)

A heap buffer overflow vulnerability was discovered in Perl. When there are non-ASCII bytes in the left-hand-side of the `tr` operator, `S_do_trans_invmap` can overflow the destination pointer `d`.    $ perl -e '$_ = "\x{FF}" x 1000000; tr/\xFF/\x{100}/;'    Segmentation fault (core dumped) It is believed that this vulnerability can enable Denial of Service and possibly Code Execution attacks on platforms that lack sufficient defenses.

CVE-2025-40909 (2025-05-30)

Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running. This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit. The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

CVE-2023-47039 (2023-10-30)

Perl for Windows relies on the system path environment variable to find the shell (cmd.exe). When running an executable which uses Windows Perl interpreter, Perl attempts to find and execute cmd.exe within the operating system. However, due to path search order issues, Perl initially looks for cmd.exe in the current working directory. An attacker with limited privileges can exploit this behavior by placing cmd.exe in locations with weak permissions, such as C:\ProgramData. By doing so, when an administrator attempts to use this executable from these compromised locations, arbitrary code can be executed.

NAME

Getopt::Std - Process single-character switches with switch clustering

SYNOPSIS

    use Getopt::Std;

    getopts('oif:');  # -o & -i are boolean flags, -f takes an argument
		      # Sets $opt_* as a side effect.
    getopts('oif:', \%opts);  # options as above. Values in %opts
    getopt('oDI');    # -o, -D & -I take arg.
                      # Sets $opt_* as a side effect.
    getopt('oDI', \%opts);    # -o, -D & -I take arg.  Values in %opts

DESCRIPTION

The getopts() function processes single-character switches with switch clustering. Pass one argument which is a string containing all switches to be recognized. For each switch found, if an argument is expected and provided, getopts() sets $opt_x (where x is the switch name) to the value of the argument. If an argument is expected but none is provided, $opt_x is set to an undefined value. If a switch does not take an argument, $opt_x is set to 1.

Switches which take an argument don't care whether there is a space between the switch and the argument. If unspecified switches are found on the command-line, the user will be warned that an unknown option was given.

The getopts() function returns true unless an invalid option was found.

The getopt() function is similar, but its argument is a string containing all switches that take an argument. If no argument is provided for a switch, say, y, the corresponding $opt_y will be set to an undefined value. Unspecified switches are silently accepted. Use of getopt() is not recommended.

Note that, if your code is running under the recommended use strict vars pragma, you will need to declare these package variables with our:

our($opt_x, $opt_y);

For those of you who don't like additional global variables being created, getopt() and getopts() will also accept a hash reference as an optional second argument. Hash keys will be x (where x is the switch name) with key values the value of the argument or 1 if no argument is specified.

To allow programs to process arguments that look like switches, but aren't, both functions will stop processing switches when they see the argument --. The -- will be removed from @ARGV.

--help and --version

If - is not a recognized switch letter, getopts() supports arguments --help and --version. If main::HELP_MESSAGE() and/or main::VERSION_MESSAGE() are defined, they are called; the arguments are the output file handle, the name of option-processing package, its version, and the switches string. If the subroutines are not defined, an attempt is made to generate intelligent messages; for best results, define $main::VERSION.

If embedded documentation (in pod format, see perlpod) is detected in the script, --help will also show how to access the documentation.

Note that due to excessive paranoia, if $Getopt::Std::STANDARD_HELP_VERSION isn't true (the default is false), then the messages are printed on STDERR, and the processing continues after the messages are printed. This being the opposite of the standard-conforming behaviour, it is strongly recommended to set $Getopt::Std::STANDARD_HELP_VERSION to true.

One can change the output file handle of the messages by setting $Getopt::Std::OUTPUT_HELP_VERSION. One can print the messages of --help (without the Usage: line) and --version by calling functions help_mess() and version_mess() with the switches string as an argument.