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Vulnerability record · CVE-2024-56406 · published 13 April 2025

CVE-2024-56406: Perl heap-based buffer overflow vulnerability

Perl · Perl

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.

8.4 CVSS 3.1 High EPSS 0.54% · top 56.6% CWE-122 · Heap-based buffer overflowCWE-787 · Out-of-bounds write
8.4CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2026-8376Perl vulnerabilityPerl versions before 5.40.5-RC1, from 5.41.0 before 5.42.3-RC1, from 5.43.0 before 5.43.11 have a heap buffer overflow when compiling regular express…EPSS 0.48%9.8CVE-2026-4176Perl vulnerabilityPerl versions from 5.9.4 before 5.40.4-RC1, from 5.41.0 before 5.42.2-RC1, from 5.43.0 before 5.43.9 contain a vulnerable version of Compress::Raw::Z…EPSS 0.81%9.8CVE-2022-48522Perl out-of-bounds write vulnerabilityIn Perl 5.34.0, function S_find_uninit_var in sv.c has a stack-based crash that can lead to remote code execution or local privilege escalation.EPSS 2.6%9.8CVE-2018-18311Perl integer overflow vulnerabilityPerl before 5.26.3 and 5.28.x before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.EPSS 12%9.8CVE-2018-18314Perl memory buffer overflow vulnerabilityPerl before 5.26.3 has a buffer overflow via a crafted regular expression that triggers invalid write operations.EPSS 6.1%9.8CVE-2018-18312Perl memory buffer overflow vulnerabilityPerl before 5.26.3 and 5.28.0 before 5.28.1 has a buffer overflow via a crafted regular expression that triggers invalid write operations.EPSS 13%9.8CVE-2018-6797Debian linux out-of-bounds write vulnerabilityAn issue was discovered in Perl 5.18 through 5.26. A crafted regular expression can cause a heap-based buffer overflow, with control over the bytes w…EPSS 6.5%9.8CVE-2018-6913Debian linux out-of-bounds write vulnerabilityHeap-based buffer overflow in the pack function in Perl before 5.26.2 allows context-dependent attackers to execute arbitrary code via a large item c…EPSS 11%

Source: NIST National Vulnerability Database (record CVE-2024-56406), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.