Bug 2404319 (CVE-2025-11683)

Summary: CVE-2025-11683 yaml-syck: YAML::Syck potential Information Disclosure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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An out of bounds read flaw has been discovered in the Perl YAML::Syck package. Missing null terminators in token.c leads to but-of-bounds read which allows adjacent variables 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.
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Bug Depends On: 2404559, 2404560, 2404562, 2404563    
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Description OSIDB Bzimport 2025-10-16 01:01:15 UTC 
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.