Description
Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.35.2 |
| Mozilla | Thunderbird | — | 140.10.2 |
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 | 140.10.2esr-1 | — |
| Debian 14 | thunderbird | 1:140.10.2esr-1 | — |
| Debian 13 | firefox-esr | 140.10.2esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.10.2esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 140.10.2esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:140.10.2esr-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 | 140.10.2-1.el10_2 | RHSA-2026:19160 |
| RHEL 10 | thunderbird | 140.11.0-1.el10_2 | RHSA-2026:22325 |
| RHEL 9 | firefox +1 | 140.10.2-1.el9_8 | RHSA-2026:20574 |
| RHEL 9 | thunderbird | 140.11.0-1.el9_8 | RHSA-2026:21381 |
| RHEL 8 | firefox | 140.10.2-1.el8_10 | RHSA-2026:20566 |
| RHEL 8 | thunderbird | 140.11.0-1.el8_10 | RHSA-2026:22643 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox | 140.10.2-1.el10_0 | RHSA-2026:24511 |
| RHEL 10.0 EUS | thunderbird | 140.11.0-1.el10_0 | RHSA-2026:26539 |
| RHEL 9.6 EUS | firefox +1 | 140.10.2-1.el9_6 | RHSA-2026:24508 |
| RHEL 9.6 EUS | thunderbird | 140.11.0-1.el9_6 | RHSA-2026:26521 |
| RHEL 9.4 E4S | firefox +1 | 140.10.2-1.el9_4 | RHSA-2026:24510 |
| RHEL 9.4 E4S | thunderbird | 140.11.0-1.el9_4 | RHSA-2026:26174 |
| RHEL 9.2 E4S | firefox +1 | 140.10.2-1.el9_2 | RHSA-2026:24509 |
| RHEL 9.2 E4S | thunderbird | 140.11.0-1.el9_2 | RHSA-2026:26269 |
| RHEL 8.8 TUS | firefox | 140.10.2-1.el8_8 | RHSA-2026:24755 |
| RHEL 8.8 TUS | thunderbird | 140.11.0-1.el8_8 | RHSA-2026:26268 |
| RHEL 8.8 E4S | firefox | 140.10.2-1.el8_8 | RHSA-2026:24755 |
| RHEL 8.8 E4S | thunderbird | 140.11.0-1.el8_8 | RHSA-2026:26268 |
| RHEL 8.6 EUS Long Life | firefox | 140.10.2-1.el8_6 | RHSA-2026:25015 |
| RHEL 8.6 EUS Long Life | thunderbird | 140.11.0-1.el8_6 | RHSA-2026:26536 |
| RHEL 8.6 AUS | firefox | 140.10.2-1.el8_6 | RHSA-2026:25015 |
| RHEL 8.6 AUS | thunderbird | 140.11.0-1.el8_6 | RHSA-2026:26536 |
| RHEL 8.4 EUS Long Life | firefox | 140.10.2-1.el8_4 | RHSA-2026:24516 |
| RHEL 8.4 EUS Long Life | thunderbird | 140.11.0-1.el8_4 | RHSA-2026:26270 |
| RHEL 8.4 AUS | firefox | 140.10.2-1.el8_4 | RHSA-2026:24516 |
| RHEL 8.4 AUS | thunderbird | 140.11.0-1.el8_4 | RHSA-2026:26270 |
| RHEL 7 ELS | firefox | 140.10.2-1.el7_9 | RHSA-2026:24983 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.10.2-1.el10_2 | ALSA-2026:19160 |
| AlmaLinux 10 | thunderbird | 140.11.0-1.el10_2.alma.1 | ALSA-2026:22325 |
| AlmaLinux 9 | firefox +1 | 140.10.2-1.el9_8 | ALSA-2026:20574 |
| AlmaLinux 9 | thunderbird | 140.11.0-1.el9_8.alma.1 | ALSA-2026:21381 |
| AlmaLinux 8 | firefox | 140.10.2-1.el8_10.alma.1 | ALSA-2026:20566 |
| AlmaLinux 8 | thunderbird | 140.11.0-1.el8_10.alma.1 | ALSA-2026:22643 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox | 140.10.2-1.el10_2 | RLSA-2026:19160 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 150.0.2-1.1 | openSUSE-SU-2026:10737-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.10.2-1.1 | openSUSE-SU-2026:10738-1, openSUSE-SU-2026:10720-1 |
| 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 | 140.10.2-1.amzn2023.0.3 | ALAS2023-2026-1725 |
| Amazon Linux 2 | thunderbird | 140.10.2-1.amzn2.0.2 | ALAS2-2026-3315 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox | 140.12.0-1.0.1.el10_2 | ELSA-2026-19160 |
| Oracle Linux 9 | firefox +1 | 140.12.0-1.0.1.el9_8 | ELSA-2026-20574 |
| Oracle Linux 8 | firefox | 140.10.2-1.0.1.el8_10 | ELSA-2026-20566 |
| Oracle Linux 7 | firefox | 140.10.2-1.0.1.el7_9 | ELSA-2026-24983 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.10.2-r0 | — |
Advisories 40
- WID-SEC-2026-1427 Mozilla Firefox und Firefox ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ALSA-2026:21381 Important: thunderbird security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:22325 Important: thunderbird security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:22643 Important: thunderbird security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:20574 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:19160 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:20566 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2026-2455 Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- RHSA-2026:26539 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:26536 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:26521 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:26270 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:26268 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:26269 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:26174 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:25015 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24983 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24755 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24516 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24511 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24509 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24510 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24508 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22643 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22325 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:21381 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:20574 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:20566 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:19160 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- ELSA-2026-19160 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 20, 2026
- openSUSE-SU-2026:21168-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Jun 30, 2026
- ELSA-2026-24983 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 29, 2026
- ELSA-2026-20574 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 29, 2026
- RLSA-2026:19160 Important: firefox security update Rocky Linux Security Advisories · May 29, 2026
- ALAS2-2026-3315 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 26, 2026
- ALAS2023-2026-1725 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 26, 2026
- ELSA-2026-20566 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 26, 2026
- openSUSE-SU-2026:10737-1 MozillaFirefox-150.0.2-1.1 on GA media SUSE / openSUSE Security Updates · May 11, 2026
- openSUSE-SU-2026:10738-1 MozillaThunderbird-140.10.2-1.1 on GA media SUSE / openSUSE Security Updates · May 11, 2026
- openSUSE-SU-2026:10720-1 firefox-esr-140.10.2-1.1 on GA media SUSE / openSUSE Security Updates · May 9, 2026
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2034352
- https://www.mozilla.org/security/advisories/mfsa2026-40/
- https://www.mozilla.org/security/advisories/mfsa2026-41/
- https://www.mozilla.org/security/advisories/mfsa2026-42/
- https://www.mozilla.org/security/advisories/mfsa2026-43/
- https://www.mozilla.org/security/advisories/mfsa2026-44/