Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.32 |
| Mozilla | Thunderbird | — | 140.7 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 140.7.0esr-1 | — |
| Debian 14 | thunderbird | 1:140.7.0esr-1 | — |
| Debian 13 | firefox-esr | 140.7.0esr-1~deb13u1 | DSA-6101-1 |
| Debian 13 | thunderbird | 1:140.7.0esr-1~deb13u1 | DSA-6103-1 |
| Debian 12 | firefox-esr | 140.7.0esr-1~deb12u1 | DSA-6101-1 |
| Debian 12 | thunderbird | 1:140.7.0esr-1~deb12u1 | DSA-6103-1 |
| Debian 11 | firefox-esr | 140.7.0esr-1~deb11u1 | DLA-4439-1 |
| Debian 11 | thunderbird | 1:140.7.0esr-1~deb11u1 | DLA-4442-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:140.7.1+build1-0ubuntu0.22.04.1 | — |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | firefox +1 | 140.7.0-1.el10_1 | RHSA-2026:2286, RHSA-2026:2271 |
| RHEL 9 | firefox +2 | 140.7.0-1.el9_7 | RHSA-2026:0924, RHSA-2026:0694 |
| RHEL 8 | firefox +1 | 140.7.0-1.el8_10 | RHSA-2026:2220, RHSA-2026:0667 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.7.0-1.el10_0 | RHSA-2026:2286, RHSA-2026:2271 |
| RHEL 9.6 EUS | firefox +1 | 140.7.0-1.el9_6 | RHSA-2026:2043 |
| RHEL 9.6 EUS | thunderbird | 140.7.0-2.el9_6 | RHSA-2026:1320 |
| RHEL 9.4 EUS | firefox +2 | 140.7.0-1.el9_4 | RHSA-2026:2041, RHSA-2026:1414 |
| RHEL 9.2 E4S | firefox +2 | 140.7.0-1.el9_2 | RHSA-2026:2044, RHSA-2026:1415 |
| RHEL 9.0 E4S | firefox +1 | 140.7.0-1.el9_0 | RHSA-2026:2047, RHSA-2026:1413 |
| RHEL 8.8 TUS | firefox +1 | 140.7.0-1.el8_8 | RHSA-2026:2069, RHSA-2026:1462 |
| RHEL 8.8 E4S | firefox +1 | 140.7.0-1.el8_8 | RHSA-2026:2069, RHSA-2026:1462 |
| RHEL 8.6 TUS | firefox +1 | 140.7.0-1.el8_6 | RHSA-2026:2070, RHSA-2026:1487 |
| RHEL 8.6 E4S | firefox +1 | 140.7.0-1.el8_6 | RHSA-2026:2070, RHSA-2026:1487 |
| RHEL 8.6 AUS | firefox +1 | 140.7.0-1.el8_6 | RHSA-2026:2070, RHSA-2026:1487 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.7.0-1.el8_4 | RHSA-2026:2073, RHSA-2026:1461 |
| RHEL 8.4 AUS | firefox +1 | 140.7.0-1.el8_4 | RHSA-2026:2073, RHSA-2026:1461 |
| RHEL 8.2 AUS | firefox +1 | 140.7.0-1.el8_2 | RHSA-2026:2074, RHSA-2026:1471 |
| RHEL 7 ELS | firefox | 140.7.0-1.el7_9 | RHSA-2026:2231 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.7.0-1.el10_1 | ALSA-2026:2271 |
| AlmaLinux 10 | thunderbird | 140.7.0-1.el10_1.alma.1 | ALSA-2026:2286 |
| AlmaLinux 9 | firefox +2 | 140.7.0-1.el9_7.alma.1 | ALSA-2026:0924, ALSA-2026:0694 |
| AlmaLinux 8 | firefox +1 | 140.7.0-1.el8_10.alma.1 | ALSA-2026:2220, ALSA-2026:0667 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox +1 | 140.7.0-1.el9_7 | RLSA-2026:0924, RLSA-2026:0694 |
| Rocky Linux 8 | firefox +1 | 140.7.0-1.el8_10 | RLSA-2026:2220, RLSA-2026:0667 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES 15 SP7 | MozillaThunderbird | 140.7.0-150200.8.251.1 | SUSE-SU-2026:0153-1 |
| SLES 15 SP6 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES 15 SP5 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES 15 SP4 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES 12 SP5 | MozillaFirefox | 140.7.0-112.295.1 | SUSE-SU-2026:0122-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 140.7.0-160000.1.1 | SUSE-SU-2026:20086-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLES 16.0 | MozillaFirefox | 140.7.0-160000.1.1 | SUSE-SU-2026:20086-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 147.0-1.1 | openSUSE-SU-2026:10046-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.7.0-1.1 | openSUSE-SU-2026:10058-1, openSUSE-SU-2026:10037-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 140.7.0-160000.1.1 | openSUSE-SU-2026:20041-1 |
| openSUSE Leap 16.0 | MozillaThunderbird | 140.8.1-bp160.1.1 | openSUSE-SU-2026:20391-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 140.7.0-150200.152.216.1 | SUSE-SU-2026:0260-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 140.7.0-150200.8.251.1 | SUSE-SU-2026:0153-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.7.0-1.amzn2023.0.1 | ALAS2023-2026-1429 |
| Amazon Linux 2 | thunderbird | 140.7.1-1.amzn2.0.1 | ALAS2-2026-3167 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.7.0-1.0.1.el10_1 | ELSA-2026-2286, ELSA-2026-2271 |
| Oracle Linux 9 | firefox +2 | 140.7.0-1.0.1.el9_7 | ELSA-2026-0924, ELSA-2026-0694 |
| Oracle Linux 8 | firefox +1 | 140.7.0-1.0.1.el8_10 | ELSA-2026-2220, ELSA-2026-0667 |
| Oracle Linux 7 | firefox | 140.7.0-1.0.1.el7_9 | ELSA-2026-2231 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.7-r0 | — |
Advisories 50
- WID-SEC-2026-0090 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 5, 2026
- ALSA-2026:2286 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:2271 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:0924 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:0694 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:0667 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:2220 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:2286 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2271 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2231 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2220 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2074 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2073 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2070 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2069 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2047 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2044 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2043 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2041 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1487 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1471 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1462 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1461 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1414 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1415 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1413 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:1320 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0924 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0694 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:0667 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2026-1730 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Jul 16, 2026
- openSUSE-SU-2026:20391-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 26, 2026
- openSUSE-SU-2026:20041-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10058-1 MozillaThunderbird-140.7.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10046-1 MozillaFirefox-147.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10037-1 firefox-esr-140.7.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20086-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0260-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0153-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0122-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2-2026-3167 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ALAS2023-2026-1429 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 18, 2026
- ELSA-2026-2231 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 18, 2026
- RLSA-2026:2220 Important: thunderbird security update Rocky Linux Security Advisories · Feb 9, 2026
- ELSA-2026-2286 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Feb 9, 2026
- ELSA-2026-2271 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Feb 9, 2026
- ELSA-2026-2220 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Feb 9, 2026
- RLSA-2026:0924 Important: thunderbird security update Rocky Linux Security Advisories · Jan 22, 2026
- ELSA-2026-0924 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jan 21, 2026
- DLA-4442-1 thunderbird - security update Debian Security (DSA / DLA) · Jan 19, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1999257
- https://www.mozilla.org/security/advisories/mfsa2026-01/
- https://www.mozilla.org/security/advisories/mfsa2026-02/
- https://www.mozilla.org/security/advisories/mfsa2026-03/
- https://www.mozilla.org/security/advisories/mfsa2026-04/
- https://www.mozilla.org/security/advisories/mfsa2026-05/