thunderbird: Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component
CVE-2026-109705 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-109705, released October 16, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| MozillaFirefox · opensuse-leap 16.0 | 153.5.0-160000.1.1 | OPENSUSE-SU-2026:22139-1 | Nov 7, 2026 |
| MozillaFirefox · sles 15.6 | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 | Nov 7, 2026 |
| MozillaFirefox · sles 15.7 | 153.5.0-150400.157.16.1 | SUSE-SU-2026:4834-1 | Nov 7, 2026 |
| MozillaFirefox · sles 16.0 | 153.5.0-160000.1.1 | SUSE-SU-2026:24260-1 | Nov 7, 2026 |
| MozillaThunderbird · sles 15.7 | 153.5.0-150400.13.9.1 | SUSE-SU-2026:4736-1 | Nov 7, 2026 |
| firefox · RHEL 10 | 153.5.0-1.el10_2 | RHSA-2026:89758 | Oct 31, 2026 |
| firefox · RHEL 8 | 0:153.5.0-1.el8_10 | RHSA-2026:89756 | Oct 31, 2026 |
| firefox · RHEL 9 | 0:153.5.0-1.el9_8 | RHSA-2026:89757 | Oct 31, 2026 |
| firefox · almalinux 10 | 153.5.0-1.el10_2 | ALSA-2026:89758 | Nov 7, 2026 |
| firefox · almalinux 8 | 153.5.0-1.el8_10 | ALSA-2026:89756 | Nov 7, 2026 |
| firefox · almalinux 9 | 153.5.0-1.el9_8 | ALSA-2026:89757 | Nov 7, 2026 |
| firefox · amzn 2023 | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 | Nov 7, 2026 |
| firefox · ol 10 | 0:153.5.0-1.0.1.el10_2 | ELSA-2026-89758 | Nov 7, 2026 |
| firefox · ol 8 | 0:153.5.0-1.0.1.el8_10 | ELSA-2026-89756 | Nov 7, 2026 |
| firefox · ol 9 | 0:153.5.0-1.0.1.el9_8 | ELSA-2026-89757 | Nov 7, 2026 |
| firefox · rocky 10 | 0:153.5.0-1.el10_2 | RLSA-2026:89758 | Nov 7, 2026 |
| firefox · rocky 8 | 0:153.5.0-1.el8_10 | RLSA-2026:89756 | Nov 7, 2026 |
| firefox · rocky 9 | 0:153.5.0-1.el9_8 | RLSA-2026:89757 | Nov 7, 2026 |
| firefox-debuginfo · amzn 2023 | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 | Nov 7, 2026 |
| firefox-debugsource · amzn 2023 | 153.5.0-1.amzn2023.0.1 | ALAS2023-2026-3281 | Nov 7, 2026 |
| firefox-esr · Debian 12.15 (bookworm) | 153.5.0esr-1~deb12u1 | DEBIAN-CVE-2026-109705 | Oct 16, 2026 |
| firefox-esr · Debian 13.5 (trixie) | 153.5.0esr-1~deb13u1 | DEBIAN-CVE-2026-109705 | Oct 16, 2026 |
| firefox-esr · Debian 14 | 153.5.0esr-1 | DEBIAN-CVE-2026-109705 | Oct 16, 2026 |
| firefox-x11 · RHEL 9 | 0:153.5.0-1.el9_8 | RHSA-2026:89757 | Oct 31, 2026 |
| firefox-x11 · almalinux 9 | 153.5.0-1.el9_8 | ALSA-2026:89757 | Nov 7, 2026 |
| firefox-x11 · ol 9 | 0:153.5.0-1.0.1.el9_8 | ELSA-2026-89757 | Nov 7, 2026 |
| thunderbird · Debian 12.15 (bookworm) | 1:153.5.1esr-1~deb12u1 | DEBIAN-CVE-2026-109705 | Oct 16, 2026 |
| thunderbird · Debian 13.5 (trixie) | 1:153.5.1esr-1~deb13u1 | DEBIAN-CVE-2026-109705 | Oct 16, 2026 |
| thunderbird · Debian 14 | 1:153.5.0esr-1 | DEBIAN-CVE-2026-109705 | Oct 16, 2026 |
| thunderbird · RHEL 9 | 0:153.5.0-1.el9_8 | RHSA-2026:93443 | Nov 3, 2026 |
| thunderbird · almalinux 9 | 153.5.0-1.el9_8.alma.1 | ALSA-2026:93443 | Nov 7, 2026 |
| thunderbird · ol 9 | 0:153.5.0-1.0.1.el9_8 | ELSA-2026-93443 | Nov 7, 2026 |
| thunderbird · rocky 9 | 0:153.5.0-1.el9_8 | RLSA-2026:93443 | Nov 7, 2026 |
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