### [CVE-2019-17008](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17008)
![](https://img.shields.io/static/v1?label=Product&message=Firefox%20ESR&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Thunderbird&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=before%2068.3%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=before%2071%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20in%20worker%20destruction&color=brightgreen)

### Description

When using nested workers, a use-after-free could occur during worker destruction. This resulted in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1546331
- https://www.mozilla.org/security/advisories/mfsa2019-38/

#### Github
No PoCs found on GitHub currently.