CVE-2017-20285
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
YAML before version 1.30 for Perl allows a loaded document to trigger the DESTROY method of arbitrary classes. The perl/hash:Class tag blesses a hash into the class it names, and Perl calls DESTROY when it goes out of scope.
Risk Assessment
An attacker can exploit DESTROY methods of classes like File::Temp::Dir to delete a directory tree, potentially leading to data loss or service disruption.
Recommendation
Update YAML to version 1.30 or later and do not process untrusted YAML documents.
Other vulnerabilities in YAML
See all- CVE-2026-33532Medium
In the yaml library on the 1.x branch before 1.10.3 or the 2.x branch before 2.8.3, parsing a YAML document may throw a RangeError due to a stack overflow. The node resolution/composition phase uses recursive function calls without a depth bound. An attacker who can supply YAML for parsing can trigger a RangeError: Maximum call stack size exceeded with a small payload (~2–10 KB). The RangeError is not a YAMLParseError, so applications that only catch YAML-specific errors will encounter an unexpected exception type, which depending on the host application's exception handling can fail requests or terminate the Node.js process.
- CVE-2019-25777High
YAML before version 1.27_001 for Perl allows a loaded perl/glob document to replace any package variable, which can lead to arbitrary code execution. The document can enable code loading options that are off by default.
Original NVD description (English source)
YAML versions before 1.30 for Perl allow a loaded document to trigger the DESTROY method of arbitrary classes. A perl/hash:Class tag blesses a hash into the class it names. The document supplies the object's fields, and Perl calls DESTROY when it goes out of scope. What DESTROY does depends on the classes the process has loaded. With File::Temp::Dir from core Perl, it can delete a directory tree the document names.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS