/ 
CGI-Session-4.43 UNAUTHORIZED RELEASE
/ CGI::Session::Driver::db_file
Security Advisories (1)
CVE-2026-56016 (2026-07-01)

CGI::Session::ID::md5 versions before 4.49 for Perl generate predictable session ids from low-entropy sources. The generate_id method builds the session id from a MD5 digest of the process id, the epoch time, and the built-in rand() function. All three are predictable, low-entropy sources: the PID is drawn from a small range, the epoch time can be guessed or read from the HTTP Date header, and Perl's rand() is unsuitable for security purposes because it is predictable and reversible. An attacker who predicts a session id can impersonate the corresponding session and bypass authentication.

NAME

CGI::Session::Driver::db_file - CGI::Session driver for BerkeleyDB using DB_File

SYNOPSIS

$s = CGI::Session->new("driver:db_file", $sid);
$s = CGI::Session->new("driver:db_file", $sid, {FileName=>'/tmp/cgisessions.db'});

DESCRIPTION

db_file stores session data in BerkelyDB file using DB_File - Perl module. All sessions will be stored in a single file, specified in FileName driver argument as in the above example. If FileName isn't given, defaults to /tmp/cgisess.db, or its equivalent on a non-UNIX system.

If the directory hierarchy leading to the file does not exist, will be created for you.

This module takes a UMask option which will be used if DB_File has to create the database file for you. By default the umask is 0660.

LICENSING

For support and licensing information see CGI::Session