Drupal core 8 before versions 8.3.4 allows remote attackers to execute arbitrary code due to the PECL YAML parser not handling PHP objects safely during certain operations.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| drupal/core(Packagist) | 8.0 | 8.3.4 | N/A |
| drupal/drupal(Packagist) | 8.0 | 8.3.4 | N/A |
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