CVE-2026-100819
Fixed in a distro release EPSS <1%CVSS 9.6
Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Products: Mozilla Firefox, Mozilla Thunderbird
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | firefox-esr | 153.4.0esr-1~deb12u1 |
| Debian 12 | thunderbird | 1:140.17.0esr-1~deb12u1 |
| Debian 13 | firefox-esr | 153.4.0esr-1~deb13u1 |
| Debian 13 | thunderbird | 1:140.17.0esr-1~deb13u1 |
| Debian 14 | firefox-esr | 153.4.0esr-1 |
| Debian 14 | thunderbird | 1:153.4.0esr-1 |
| Rocky Linux 10 | firefox | 0:140.17.0-1.el10_2 |
| Rocky Linux 10 | thunderbird | 0:140.17.0-1.el10_2 |
| Rocky Linux 8 | firefox | 0:140.17.0-1.el8_10 |
| Rocky Linux 9 | firefox | 0:140.17.0-1.el9_8 |
| Rocky Linux 9 | thunderbird | 0:140.17.0-1.el9_8 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP7 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | MozillaThunderbird | 153.4.0-150400.13.6.1 |
| SUSE Linux Enterprise Server 12 SP5-LTSS | MozillaFirefox | 153.4.0-118.11.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Server 16.0 | MozillaFirefox | 153.4.0-160000.1.1 |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | MozillaFirefox | 153.4.0-118.11.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | MozillaFirefox | 153.4.0-150400.157.11.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | MozillaFirefox | 153.4.0-160000.1.1 |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | MozillaThunderbird | 153.4.0-150400.13.6.1 |
| Ubuntu 18.04 LTS | mozjs38 | no fix |
| Ubuntu 18.04 LTS | mozjs52 | no fix |
| Ubuntu 20.04 LTS | mozjs52 | no fix |
| Ubuntu 20.04 LTS | mozjs68 | no fix |
| Ubuntu 22.04 LTS | mozjs102 | no fix |
| Ubuntu 22.04 LTS | mozjs78 | no fix |
| Ubuntu 22.04 LTS | mozjs91 | no fix |
| Ubuntu 22.04 LTS | thunderbird | no fix |
| Ubuntu 24.04 LTS | mozjs102 | no fix |
| Ubuntu 24.04 LTS | mozjs115 | no fix |
| openSUSE Leap 16.0 | MozillaFirefox | 153.4.0-160000.1.1 |
| openSUSE Tumbleweed | MozillaFirefox | 157.0.1-1.1 |
| openSUSE Tumbleweed | MozillaThunderbird | 153.4.0-1.1 |
| openSUSE Tumbleweed | firefox-esr | 153.4.0-1.1 |