// For flags

CVE-2024-56406

Perl is vulnerable to a heap buffer overflow when transliterating non-ASCII bytes

Severity Score

8.6
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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.

A flaw was found in Perl. This vulnerability allows a heap buffer overflow, which can lead to denial of service and potential arbitrary code execution on platforms that lack sufficient defenses via specially crafted input to the tr/// transliteration operator containing non-ASCII bytes on the left-hand side.

USN-7434-1 fixed a vulnerability in Perl. This update provides the corresponding update for Ubuntu 25.04. It was discovered that Perl incorrectly handled transliterating non-ASCII bytes. A remote attacker could use this issue to cause Perl to crash, resulting in a denial of service, or possibly execute arbitrary code.

*Credits: Nathan Mills
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-12-23 CVE Reserved
  • 2025-04-13 CVE Published
  • 2025-04-18 CVE Updated
  • 2025-06-27 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-122: Heap-based Buffer Overflow
  • CWE-787: Out-of-bounds Write
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Perl
Search vendor "Perl"
 Perl
Search vendor "Perl" for product "Perl"
 >= 5.41.0 <= 5.41.10
Search vendor "Perl" for product "Perl" and version " >= 5.41.0 <= 5.41.10"
en
Affected