Apple has responded to concerns about “Shellshock,” a pair of vulnerabilities in versions of the GNU Bourne-Again Shell (bash), issuing a statement that the company is “working to quickly provide a fix” to the vulnerability. However, a company spokesperson said that most Mac OS X users have nothing to fear. “The vast majority of OS X users are not at risk to recently reported bash vulnerabilities,” an Apple spokesperson said in a statement to the Apple-focused site iMore. “With OS X, systems are safe by default and not exposed to remote exploits of bash unless users configure advanced Unix services.” Mac OS X uses version 3.2.51.(1) of GNU bash, released in 2007; the current GNU release of the shell is bash 4.3. However, the current version is released under the GNU Public License version 3 (GPLv3). Apple has avoided bundling GPLv3-licensed software because of its stricter license terms, even dropping the open-source Windows networking service Samba from OS X server in 2011 because Samba had shifted to a GPLv3 license.