cve/2020/CVE-2020-26960.md

### [CVE-2020-26960](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26960)
![](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=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Potential%20use-after-free%20in%20uses%20of%20nsTArray&color=brighgreen)

### Description

If the Compact() method was called on an nsTArray, the array could have been reallocated without updating other pointers, leading to a potential use-after-free and exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1670358
- https://bugzilla.mozilla.org/show_bug.cgi?id=1670358

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