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perl-5.42.2
⭐ Starred 2013 / Time::gmtime
Security Advisories (1)
CVE-2026-8376 (2026-05-25)

Perl versions through 5.43.10 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds. Perl_study_chunk in regcomp_study.c checked the size of the joined substring buffer in characters rather than bytes. For a quantified fixed substring with a large minimum count, the byte length mincount * l could overflow SSize_t, producing an undersized SvGROW allocation; the subsequent copy writes past the end of the buffer. A caller that compiles an attacker-controlled regular expression on a 32-bit perl build triggers a heap buffer overflow at compile time.

NAME

Time::gmtime - by-name interface to Perl's built-in gmtime() function

SYNOPSIS

use Time::gmtime;
$gm = gmtime();
printf "The day in Greenwich is %s\n", 
   (qw(Sun Mon Tue Wed Thu Fri Sat Sun))[ $gm->wday() ];

use Time::gmtime qw(:FIELDS);
gmtime();
printf "The day in Greenwich is %s\n", 
   (qw(Sun Mon Tue Wed Thu Fri Sat Sun))[ $tm_wday ];

$now = gmctime();

use Time::gmtime;
use File::stat;
$date_string = gmctime(stat($file)->mtime);

DESCRIPTION

This module's default exports override the core gmtime() function, replacing it with a version that returns "Time::tm" objects. This object has methods that return the similarly named structure field name from the C's tm structure from time.h; namely sec, min, hour, mday, mon, year, wday, yday, and isdst.

You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your core functions.) Access these fields as variables named with a preceding tm_ in front their method names. Thus, $tm_obj->mday() corresponds to $tm_mday if you import the fields.

The gmctime() function provides a way of getting at the scalar sense of the original CORE::gmtime() function.

To access this functionality without the core overrides, pass the use an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the CORE:: pseudo-package.

NOTE

While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this.

AUTHOR

Tom Christiansen