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A use-after-free vulnerability can occur in the Fetch API when the worker or the associated window are freed when still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Dec 1, 2017 | Oct 25, 2017 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jun 11, 2018 |
| Centos_linux | — | Upgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade thunderbird | Oct 2, 2017 | Sep 29, 2017 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Sep 30, 2017 | Sep 29, 2017 |
| Freebsd | — | Upgrade linux-firefoxUpgrade linux-thunderbirdUpgrade firefox-esrUpgrade thunderbirdUpgrade seamonkeyUpgrade linux-seamonkeyUpgrade libxulUpgrade firefox | Sep 29, 2017 | Sep 29, 2017 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade www-client/firefox.Upgrade mail-client/thunderbird.Upgrade mail-client/thunderbird-bin. | Feb 20, 2018 | Feb 20, 2018 |
| Mfsa2017 21 | — | Upgrade to Mozilla Firefox version 56.0Upgrade to the latest version of Mozilla Firefox | Jul 12, 2018 | Jun 11, 2018 |
| Mfsa2017 22 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 52.4 | Sep 29, 2017 | Sep 28, 2017 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 52.4 | Oct 11, 2017 | Oct 9, 2017 |
| Oracle Solaris | — | Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 52.4.0-0.175.3.26.0.4.0 on Solaris 11.3Upgrade mail/thunderbird to version 52.4.0-0.175.3.26.0.4.0 on Solaris 11.3Upgrade web/browser/firefox to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade web/browser/firefox/plugin/firefox-java to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3Upgrade web/data/firefox-bookmarks to version 52.4.0-0.175.3.25.0.3.0 on Solaris 11.3 | Nov 30, 2017 | Nov 30, 2017 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Sep 29, 2017 | Sep 28, 2017 |
| Redhat_linux | — | Upgrade firefoxUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade firefox-debuginfo | Oct 4, 2017 | Sep 29, 2017 |
| Suse | — | Upgrade libsoftokn3-32bitUpgrade libfreebl3-hmacUpgrade MozillaFirefox-translationsUpgrade libfreebl3Upgrade mozilla-nss-32bitUpgrade MozillaFirefoxUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-buildsymbolsUpgrade libsoftokn3-hmacUpgrade mozilla-nss-x86Upgrade libsoftokn3-x86Upgrade libfreebl3-32bitUpgrade mozilla-nss-sysinit-32bitUpgrade mozilla-nss-certsUpgrade mozilla-nssUpgrade mozilla-nss-sysinitUpgrade MozillaThunderbirdUpgrade mozilla-nss-certs-32bitUpgrade MozillaFirefox-develUpgrade libfreebl3-hmac-32bitUpgrade mozilla-nss-toolsUpgrade libfreebl3-x86Upgrade MozillaThunderbird-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade libsoftokn3Upgrade MozillaThunderbird-develUpgrade libsoftokn3-hmac-32bitUpgrade mozilla-nss-develUpgrade MozillaFirefox-translations-other | Oct 2, 2017 | Sep 29, 2017 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Oct 3, 2017 | Sep 29, 2017 |
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