CVE-2024-56406 Information

Description

A heap buffer overflow vulnerability was discovered in Perl.

Release branches 5.34 5.36 5.38 and 5.40 are affected including development versions from 5.33.1 through 5.41.10.

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 1000000; tr/\xFF/\x100/;’    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.

Reference

http://www.openwall.com/lists/oss-security/2025/04/13/3 http://www.openwall.com/lists/oss-security/2025/04/13/4 http://www.openwall.com/lists/oss-security/2025/04/13/5 https://github.com/Perl/perl5/commit/87f42aa0e0096e9a346c9672aa3a0bd3bef8c1dd.patch https://metacpan.org/release/SHAY/perl-5.38.4/changes https://metacpan.org/release/SHAY/perl-5.40.2/changes