CVE-2019-6339: PHAR stream wrapper Arbitrary PHP code execution

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 35.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-01-22 · updated 2026-06-17
Weakness: CWE-20

Description

In Drupal Core versions 7.x prior to 7.62, 8.6.x prior to 8.6.6 and 8.5.x prior to 8.5.9; A remote code execution vulnerability exists in PHP's built-in phar stream wrapper when performing file operations on an untrusted phar:// URI. Some Drupal code (core, contrib, and custom) may be performing file operations on insufficiently validated user input, thereby being exposed to this vulnerability. This vulnerability is mitigated by the fact that such code paths typically require access to an administrative permission or an atypical configuration.

Affected products

Debian Linux: 8.0, 9.0
Drupal: from 7.0 before 7.62; from 8.5.0 before 8.5.9; from 8.6.0 before 8.6.6 — fixed in 7.62, 8.5.9, 8.6.6

How to fix

Upgrade to a fixed version: Drupal 7.62, 8.5.9, 8.6.6. Check the vendor advisory for mitigations.

References

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