Description
Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 140.10.1 |
| Mozilla | Thunderbird | — | 140.10.1 |
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 | 140.10.1esr-1 | — |
| Debian 14 | thunderbird | 1:140.10.1esr-1 | — |
| Debian 13 | firefox-esr | 140.10.1esr-1~deb13u1 | — |
| Debian 13 | thunderbird | 1:140.10.1esr-1~deb13u1 | — |
| Debian 12 | firefox-esr | 140.10.1esr-1~deb12u1 | — |
| Debian 12 | thunderbird | 1:140.10.1esr-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 | 140.10.1-1.el10_2 | RHSA-2026:19157, RHSA-2026:19153 |
| RHEL 9 | firefox +2 | 140.10.1-1.el9_8 | RHSA-2026:19370, RHSA-2026:19348 |
| RHEL 8 | firefox +1 | 140.10.1-1.el8_10 | RHSA-2026:20586, RHSA-2026:19588 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | firefox +1 | 140.10.1-1.el10_0 | RHSA-2026:24719, RHSA-2026:22408 |
| RHEL 9.6 EUS | firefox +2 | 140.10.1-1.el9_6 | RHSA-2026:24721, RHSA-2026:22409 |
| RHEL 9.4 E4S | firefox +2 | 140.10.1-1.el9_4 | RHSA-2026:24846, RHSA-2026:22324 |
| RHEL 9.2 E4S | firefox +2 | 140.10.1-1.el9_2 | RHSA-2026:24844, RHSA-2026:22410 |
| RHEL 9.0 E4S | firefox | 140.10.1-1.el9_0 | RHSA-2026:21743 |
| RHEL 8.8 TUS | firefox +1 | 140.10.1-1.el8_8 | RHSA-2026:24717, RHSA-2026:22847 |
| RHEL 8.8 E4S | firefox +1 | 140.10.1-1.el8_8 | RHSA-2026:24717, RHSA-2026:22847 |
| RHEL 8.6 EUS Long Life | firefox +1 | 140.10.1-1.el8_6 | RHSA-2026:25014, RHSA-2026:24345 |
| RHEL 8.6 AUS | firefox +1 | 140.10.1-1.el8_6 | RHSA-2026:25014, RHSA-2026:24345 |
| RHEL 8.4 EUS Long Life | firefox +1 | 140.10.1-1.el8_4 | RHSA-2026:24718, RHSA-2026:22712 |
| RHEL 8.4 AUS | firefox +1 | 140.10.1-1.el8_4 | RHSA-2026:24718, RHSA-2026:22712 |
| RHEL 7 ELS | firefox | 140.10.1-1.el7_9 | RHSA-2026:22708 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 140.10.1-1.el10_2 | ALSA-2026:19157 |
| AlmaLinux 10 | thunderbird | 140.10.1-1.el10_2.alma.1 | ALSA-2026:19153 |
| AlmaLinux 9 | firefox +2 | 140.10.1-1.el9_8.alma.1 | ALSA-2026:19370, ALSA-2026:19348 |
| AlmaLinux 8 | firefox +1 | 140.10.1-1.el8_10.alma.1 | ALSA-2026:20586, ALSA-2026:19588 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | thunderbird | 140.10.1-1.el10_2 | RLSA-2026:19153 |
| Rocky Linux 9 | firefox +1 | 140.10.1-1.el9_8 | RLSA-2026:19370, RLSA-2026:19348 |
| Rocky Linux 8 | firefox +1 | 140.10.1-1.el8_10 | RLSA-2026:20586, RLSA-2026:19588 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 150.0.1-1.1 | openSUSE-SU-2026:10668-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.10.1-1.1 | openSUSE-SU-2026:10687-1, openSUSE-SU-2026:10661-1 |
| 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 | 140.10.1-1.amzn2023.0.1 | ALAS2023-2026-1652 |
| Amazon Linux 2 | thunderbird | 140.10.1-1.amzn2.0.1 | ALAS2-2026-3295 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 140.12.0-1.0.1.el10_2 | ELSA-2026-19157, ELSA-2026-19153 |
| Oracle Linux 9 | firefox +1 | 140.12.0-1.0.1.el9_8 | ELSA-2026-19370 |
| Oracle Linux 9 | thunderbird | 140.11.0-1.0.1.el9_8 | ELSA-2026-19348 |
| Oracle Linux 8 | firefox +1 | 140.10.1-1.0.1.el8_10 | ELSA-2026-20586, ELSA-2026-19588 |
| Oracle Linux 7 | firefox | 140.10.1-1.0.1.el7_9 | ELSA-2026-22708 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 140.10.1-r0 | — |
Advisories 49
- WID-SEC-2026-1296 Mozilla Firefox und Firefox ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ALSA-2026:19153 Important: thunderbird security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:19157 Important: firefox security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:19370 Important: firefox security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:19348 Important: thunderbird security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:19588 Important: firefox security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2026:20586 Important: thunderbird security update AlmaLinux Security Advisories · Nov 6, 2026
- WID-SEC-2026-2455 Oracle Solaris Drittanbieterkomponenten: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 27, 2026
- RHSA-2026:22324 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24718 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24719 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22409 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22410 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24846 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:19153 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:19157 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24717 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:25014 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24844 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24721 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:24345 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22847 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22712 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22708 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:22408 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:21743 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:20586 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:19588 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:19370 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- RHSA-2026:19348 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 29, 2026
- ELSA-2026-19153 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 20, 2026
- ELSA-2026-19157 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 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-2026:21168-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Jun 30, 2026
- ELSA-2026-19370 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 29, 2026
- ELSA-2026-19348 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 26, 2026
- ELSA-2026-22708 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 15, 2026
- RLSA-2026:19153 Important: thunderbird security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:20586 Important: thunderbird security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:19370 Important: firefox security update Rocky Linux Security Advisories · May 28, 2026
- RLSA-2026:19348 Important: thunderbird security update Rocky Linux Security Advisories · May 28, 2026
- ELSA-2026-20586 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 27, 2026
- RLSA-2026:19588 Important: firefox security update Rocky Linux Security Advisories · May 23, 2026
- ELSA-2026-19588 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 23, 2026
- ALAS2-2026-3295 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 13, 2026
- ALAS2023-2026-1652 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · May 13, 2026
- openSUSE-SU-2026:10687-1 MozillaThunderbird-140.10.1-1.1 on GA media SUSE / openSUSE Security Updates · May 6, 2026
- openSUSE-SU-2026:10668-1 MozillaFirefox-150.0.1-1.1 on GA media SUSE / openSUSE Security Updates · May 5, 2026
- openSUSE-SU-2026:10661-1 firefox-esr-140.10.1-1.1 on GA media SUSE / openSUSE Security Updates · May 1, 2026
References
- Memory safety bugs fixed in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1
- https://www.mozilla.org/security/advisories/mfsa2026-35/
- https://www.mozilla.org/security/advisories/mfsa2026-36/
- https://www.mozilla.org/security/advisories/mfsa2026-38/
- https://www.mozilla.org/security/advisories/mfsa2026-39/