CVE-2024-56406
Perl is vulnerable to a heap buffer overflow when transliterating non-ASCII bytes
- State
- Published
- Severity
- 8.4 High
- Published
- Apr 13, 2025
- Updated
- Oct 16, 2025
- Reserved
- Dec 23, 2024
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{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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.4 High | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
perlperl |
|
References
- https://github.com/Perl/perl5/commit/87f42aa0e0096e9a346c9672aa3a0bd3bef8c1dd.patchpatch
- https://metacpan.org/release/SHAY/perl-5.38.4/changesrelease-notes
- https://metacpan.org/release/SHAY/perl-5.40.2/changesrelease-notes
- 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
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