Critical 18∕25 AC:Complex/A:User/CI:All/II:All/E:Exploit/TD:Uncommon
Arbitrary PHP code execution
The Drupal project uses the PEAR Archive_Tar library. The PEAR Archive_Tar library has released a security update that impacts Drupal. For more information please see:
Multiple vulnerabilities are possible if Drupal is configured to allow
.tlz file uploads and processes them.
To mitigate this issue, prevent untrusted users from uploading
This is a different issue than SA-CORE-2019-012. Similar configuration changes may mitigate the problem until you are able to patch.
Install the latest version:
Versions of Drupal 8 prior to 8.8.x are end-of-life and do not receive security coverage.
According to the regular security release window schedule, November 25th would not typically be a core security window. However, this release is necessary because there are known exploits for one of core's dependencies and some configurations of Drupal are vulnerable.