Wednesday, Dec 18th, 2019
Security risk: 
Advisory ID: 
Third Party Libraries
Multiple vulnerabilities
Versions affected: 
  • Backdrop Core 1.14.x versions prior to 1.14.2
  • Backdrop Core 1.13.x versions prior to 1.13.5



The Backdrop CMS project uses the third-party library Archive_Tar, which has released a security update that impacts some Backdrop configurations.

Multiple vulnerabilities are possible if Backdrop is configured to allow .tar.tar.gz.bz2 or .tlz file uploads, and processes them.

The latest versions of Backdrop update Archive_Tar to 1.4.9 to mitigate these file processing vulnerabilities.


Upgrade your site to the most recent version of Backdrop core. Download available on the Backdrop CMS 1.14.2 release page. See the update instructions, if needed.

Reported By: 
Fixed By: 
Coordinated By: 

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