Description
Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. 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
- Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thunderbird 150.0.2
- 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/