A buffer overflow can occur when manipulating the SVG animatedPathSegList through script. This results in a potentially exploitable crash. A lack of parameter validation on IPC messages results in a potential out-of-bounds write through malformed IPC messages. This can potentially allow for sandbox escape through memory corruption in the parent process. When packets with a mismatched RTP payload type are sent in WebRTC connections, in some circumstances a potentially exploitable crash is triggered. Under certain circumstances the fetch() API can return transient local copies of resources that were sent with a no-store or no-cache cache header instead of downloading a copy from the network as it should. This can result in previously stored, locally cached data of a website being accessible to users if they share a common profile while browsing. An integer overflow can occur during conversion of text to some Unicode character sets due to an unchecked length parameter. Mozilla developers and community members Bob Clary, Olli Pettay, Christoph Diehl, Christian Holler, Nils Ohlmeier, Randell Jesup, Tyson Smith, Ralph Giles, and Philipp reported memory safety bugs present in Firefox 58 and Firefox ESR 52.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. Mozilla developers Jet Villegas and Randell Jesup reported memory safety bugs present in Firefox ESR 52.6. These bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.