| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 52.3.0< 55.0 | 52.3.055.0 |
| thunderbird | < 52.3.0 | 52.3.0 |
A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.
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