Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Aug 22, 2024 | Apr 26, 2019 |
| Amazon Linux Ami 2 | — | Upgrade thunderbird-debuginfoUpgrade thunderbird | Apr 27, 2020 | Apr 26, 2019 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Apr 26, 2019 |
| Centos_linux | — | Upgrade thunderbirdUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox | Apr 3, 2019 | Mar 27, 2019 |
| Debian | — | Upgrade firefox-esr | Mar 25, 2019 | Mar 25, 2019 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird. | Apr 3, 2019 | Apr 2, 2019 |
| Huawei Euleros 2_0_sp2 | — | Upgrade firefox | May 30, 2019 | Apr 26, 2019 |
| Huawei Euleros 2_0_sp3 | — | Upgrade firefox | May 30, 2019 | Apr 26, 2019 |
| Huawei Euleros 2_0_sp9 | — | Upgrade mozjs60 | Apr 19, 2022 | Apr 26, 2019 |
| Mfsa2019 09 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 66.0.1 | Mar 25, 2019 | Mar 22, 2019 |
| Mfsa2019 10 | — | Upgrade to Mozilla Firefox ESR version 60.6.1Upgrade to the latest version of Mozilla Firefox | Mar 25, 2019 | Mar 22, 2019 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 60.6.1Upgrade to the latest version of Mozilla Thunderbird | Mar 26, 2019 | Mar 25, 2019 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 60.6.3-11.4.9.0.1.4.0 on Solaris 11.4Upgrade web/browser/firefox to version 60.6.3-11.4.9.0.1.4.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 60.6.1-11.4.9.0.1.2.0 on Solaris 11.4Upgrade mail/thunderbird to version 60.6.1-11.4.9.0.1.2.0 on Solaris 11.4 | May 30, 2019 | Apr 26, 2019 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | Apr 1, 2019 | Mar 22, 2019 |
| Redhat_linux | — | Upgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade firefox-debuginfo | Mar 28, 2019 | Mar 27, 2019 |
| Suse | — | Upgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefoxUpgrade mozillafirefox-branding-upstreamUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-buildsymbolsUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird | Apr 1, 2019 | Mar 27, 2019 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Apr 3, 2019 | Mar 27, 2019 |
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