Mozilla is urging users to update to the latest version of Firefox after two vulnerabilities (CVE-2022-26485 and CVE-2022-26486) have been found to be actively exploited in the wild. Both vulnerabilities are listed as use-after-free vulnerabilities. This type of vulnerability relies on issues in determining which part of an application is responsible for cleaning up used memory. By leveraging this an attacker can set up a situation where they can re-use a part of memory that was freed up by a legitimate process.