---
id: CVE-2017-20285
title: >-
  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
summary: >-
  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 DESTR…
severity: none
cwe:
  - CWE-470
  - CWE-502
product: YAML
affected:
  - YAML < 1.30
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T07:16:29.017'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-20285'
references:
  - url: >-
      https://github.com/ingydotnet/yaml-pm/commit/471314bbdcbd62077eea32755929122aa8bd00a3.patch
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: >-
      https://github.com/ingydotnet/yaml-pm/commit/7736f38bd02e4f9f77d5468721e3be3d7b34a8ec.patch
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://github.com/ingydotnet/yaml-pm/issues/176'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://metacpan.org/release/TINITA/YAML-1.30/changes'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-05T07:14:48.254Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.