CVE-2026-109782
firefox-esr: Mitigation bypass in the File Handling component
CVE-2026-109782 is fixed in 8 products on 1 platform, first by DEBIAN-CVE-2026-109782, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
8.3
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0027
19th percentile
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
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 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 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 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 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-2026-109782 | Oct 16, 2026 |
| firefox-esr · Debian 13.5 (trixie) | 153.5.0esr-1~deb13u1 | DEBIAN-CVE-2026-109782 | Oct 16, 2026 |
| firefox-esr · Debian 14 | 153.5.0esr-1 | DEBIAN-CVE-2026-109782 | 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 · 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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