CVE-2024-56406

Name: CVE-2024-56406
Creator: NVD / NIST
Published: 2025-04-13T14:15:14.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.4/10EPSS 0.47%

Last modified Jun 17, 2026

CVE-2024-56406 is a high-severity vulnerability rated 8.4/10 on the CVSS scale. 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.. EPSS estimates a 0.47% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.4/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.47%

37.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Perl	Perl	>= 5.33.1, < 5.38.4
Perl	Perl	>= 5.39.0, < 5.40.2
Perl	Perl	>= 5.41.0, <= 5.41.10

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/2025/04/13/3Mailing List
http://www.openwall.com/lists/oss-security/2025/04/13/4Mailing List
http://www.openwall.com/lists/oss-security/2025/04/13/5Mailing List

Timeline

Published: Apr 13, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-56406?

How severe is CVE-2024-56406?

CVE-2024-56406 has a CVSS score of 8.4/10 (HIGH severity). The EPSS model estimates a 0.47% probability of exploitation in the next 30 days.

How do I fix CVE-2024-56406?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-56406?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST