Description
Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.37 |
| Mozilla | Thunderbird | — | 140.12 |
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 | 140.12.0esr-1 | — |
| Debian 14 | thunderbird | 1:140.12.0esr-1 | — |
| Debian 13 | firefox-esr | 140.12.0esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.12.0esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 140.12.0esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:140.12.0esr-1~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +3 | No fix yet | — |
| 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 | 140.12.0-1.el10_2 | RHSA-2026:30846, RHSA-2026:27733 |
| RHEL 9 | firefox +2 | 140.12.0-1.el9_8 | RHSA-2026:29940, RHSA-2026:27734 |
| RHEL 8 | firefox +1 | 140.12.0-1.el8_10 | RHSA-2026:33445, RHSA-2026:27717 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.12.0-1.el10_0 | RHSA-2026:38751, RHSA-2026:36100 |
| RHEL 9.6 EUS | firefox +2 | 140.12.0-1.el9_6 | RHSA-2026:38750, RHSA-2026:37391 |
| RHEL 9.4 E4S | firefox +2 | 140.12.0-1.el9_4 | RHSA-2026:39011, RHSA-2026:38753 |
| RHEL 9.2 E4S | firefox +2 | 140.12.0-1.el9_2 | RHSA-2026:39706, RHSA-2026:36101 |
| RHEL 8.8 TUS | firefox +1 | 140.12.0-1.el8_8 | RHSA-2026:39142, RHSA-2026:36103 |
| RHEL 8.8 E4S | firefox +1 | 140.12.0-1.el8_8 | RHSA-2026:39142, RHSA-2026:36103 |
| RHEL 8.6 EUS Long Life | firefox +1 | 140.12.0-1.el8_6 | RHSA-2026:39141, RHSA-2026:37210 |
| RHEL 8.6 AUS | firefox +1 | 140.12.0-1.el8_6 | RHSA-2026:39141, RHSA-2026:37210 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.12.0-1.el8_4 | RHSA-2026:39428, RHSA-2026:36102 |
| RHEL 8.4 AUS | firefox +1 | 140.12.0-1.el8_4 | RHSA-2026:39428, RHSA-2026:36102 |
| RHEL 7 ELS | firefox | 140.12.0-1.el7_9 | RHSA-2026:38506 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.12.0-1.el10_2 | ALSA-2026:27733 |
| AlmaLinux 10 | thunderbird | 140.12.0-1.el10_2.alma.1 | ALSA-2026:30846 |
| AlmaLinux 9 | firefox +2 | 140.12.0-1.el9_8.alma.1 | ALSA-2026:29940, ALSA-2026:27734 |
| AlmaLinux 8 | firefox +1 | 140.12.0-1.el8_10.alma.1 | ALSA-2026:33445, ALSA-2026:27717 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 140.12.0-1.el10_2 | RLSA-2026:30846, RLSA-2026:27733 |
| Rocky Linux 9 | firefox +1 | 140.12.0-1.el9_8 | RLSA-2026:29940, RLSA-2026:27734 |
| Rocky Linux 8 | firefox +1 | 140.12.0-1.el8_10 | RLSA-2026:33445, RLSA-2026:27717 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES 15 SP7 | MozillaThunderbird | 140.12.0-150200.8.277.1 | SUSE-SU-2026:2852-1 |
| SLES 15 SP6 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES 15 SP5 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES 15 SP4 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES 12 SP5 | MozillaFirefox | 140.12.0-112.321.1 | SUSE-SU-2026:2583-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | MozillaFirefox | 140.12.0-160000.1.1 | SUSE-SU-2026:23137-1, SUSE-SU-2026:23115-1, SUSE-SU-2026:22351-1 |
| SLES for SAP 15 SP6 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLES 16.0 | MozillaFirefox | 140.12.0-160000.1.1 | SUSE-SU-2026:23137-1, SUSE-SU-2026:23115-1, SUSE-SU-2026:22351-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 140.12.0-150200.152.245.1 | SUSE-SU-2026:2814-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 152.0-1.1 | openSUSE-SU-2026:11052-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.12.0-1.1 | openSUSE-SU-2026:11072-1, openSUSE-SU-2026:11055-1 |
| openSUSE Leap 16.0 | MozillaFirefox | 140.12.0-160000.1.1 | openSUSE-SU-2026:21519-1, openSUSE-SU-2026:21043-1 |
| openSUSE Leap 16.0 | MozillaThunderbird | 140.12.0-bp160.1.1 | openSUSE-SU-2026:21168-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.12.0-1.amzn2023.0.1 | ALAS2023-2026-1928 |
| Amazon Linux 2 | thunderbird | 140.12.0-1.amzn2.0.1 | ALAS2-2026-3795 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.12.0-1.0.1.el10_2 | ELSA-2026-30846, ELSA-2026-27733 |
| Oracle Linux 9 | firefox +2 | 140.12.0-1.0.1.el9_8 | ELSA-2026-29940, ELSA-2026-27734 |
| Oracle Linux 8 | firefox +1 | 140.12.0-1.0.1.el8_10 | ELSA-2026-33445, ELSA-2026-27717 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.12-r0 | — |
Advisories 50
- ALSA-2026:29940 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:27734 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:30846 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:27733 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:27717 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:33445 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-1959 Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 16, 2026
- SUSE-SU-2026:23137-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23115-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 14, 2026
- openSUSE-SU-2026:21519-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Aug 4, 2026
- ELSA-2026-27733 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 17, 2026
- RHSA-2026:39706 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:39428 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:39142 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:39141 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:39011 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:38753 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:38750 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:38751 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:38506 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:37391 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:37210 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:36103 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:36102 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:36101 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:36100 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:33445 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:30846 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:29940 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:27733 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:27734 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- RHSA-2026:27717 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 16, 2026
- ELSA-2026-30846 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 16, 2026
- SUSE-SU-2026:2852-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Jul 13, 2026
- SUSE-SU-2026:2814-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Jul 10, 2026
- ALAS2-2026-3795 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 7, 2026
- ALAS2023-2026-1928 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 7, 2026
- RLSA-2026:30846 Important: thunderbird security update Rocky Linux Security Advisories · Jul 5, 2026
- RLSA-2026:33445 Important: thunderbird security update Rocky Linux Security Advisories · Jul 4, 2026
- SUSE-SU-2026:22351-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Jul 2, 2026
- openSUSE-SU-2026:21043-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Jun 30, 2026
- openSUSE-SU-2026:21168-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Jun 30, 2026
- ELSA-2026-33445 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 30, 2026
- RLSA-2026:29940 Important: thunderbird security update Rocky Linux Security Advisories · Jun 26, 2026
- ELSA-2026-29940 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 26, 2026
- RLSA-2026:27717 Important: firefox security update Rocky Linux Security Advisories · Jun 25, 2026
- RLSA-2026:27733 Important: firefox security update Rocky Linux Security Advisories · Jun 24, 2026
- RLSA-2026:27734 Important: firefox security update Rocky Linux Security Advisories · Jun 24, 2026
- openSUSE-SU-2026:11072-1 MozillaThunderbird-140.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Jun 24, 2026
- SUSE-SU-2026:2583-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Jun 24, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2039873
- https://www.mozilla.org/security/advisories/mfsa2026-57/
- https://www.mozilla.org/security/advisories/mfsa2026-58/
- https://www.mozilla.org/security/advisories/mfsa2026-59/
- https://www.mozilla.org/security/advisories/mfsa2026-60/
- https://www.mozilla.org/security/advisories/mfsa2026-61/