CPANSA-YAML-Syck-2025-11683: YAML-Syck vulnerability

Publisher giterlizzi Document category csaf_security_advisory
Initial release date 2025-10-16T00:00:00 Engine CSAF Perl Toolkit 0.26
Current release date 2025-10-16T00:00:00 Build Date
Current version 1 Status final
CVSS v3.1 Base Score 6.5 Severity
Original language Language en
Also referred to

Vulnerability Description

YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read The issue is seen with complex YAML files with a hash of all keys and empty values.  There is no indication that the issue leads to accessing memory outside that allocated to the module.

Vulnerabilities

CVE-2025-11683

Vulnerability Description

YAML::Syck versions before 1.36 for Perl has missing null-terminators which causes out-of-bounds read and potential information disclosure

Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variable to be read

The issue is seen with complex YAML files with a hash of all keys and empty values.  There is no indication that the issue leads to accessing memory outside that allocated to the module.

Weakness CWE-119 : Improper Restriction of Operations within the Bounds of a Memory Buffer

Product status

Known affected
Product Score
YAML-Syck less than 1.36
CVSS Version CVSS Vector CVSS Base Score CVSS Base Severity
3.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 6.5 Medium
Fixed

giterlizzi

Namespace: https://github.com/giterlizzi/

gdt@cpan.org

References

Revision history

Version Date of the revision Summary of the revision
1 Thu Oct 16 00:00:00 2025 First release

Sharing rules

TLP:WHITE
For the TLP version see: https://www.first.org/tlp/