Description
Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | — | 140.15 |
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 | thunderbird | 1:153.2.0esr-1 | — |
| Debian 13 | thunderbird | 1:140.15.0esr-1~deb13u1 | — |
| Debian 12 | thunderbird | 1:140.15.0esr-1~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | thunderbird | No fix yet | — |
| Ubuntu 26.04 LTS | thunderbird | No fix yet | — |
| Ubuntu 24.04 LTS | thunderbird | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | thunderbird | 140.16.0-1.el10_2 | RHSA-2026:73130 |
| RHEL 9 | thunderbird | 140.16.0-1.el9_8 | RHSA-2026:70642 |
| RHEL 8 | thunderbird | 140.16.0-1.el8_10 | RHSA-2026:73971 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | thunderbird | 140.15.0-1.el10_0 | RHSA-2026:77631 |
| RHEL 9.6 EUS | thunderbird | 140.15.0-1.el9_6 | RHSA-2026:80503 |
| RHEL 9.4 E4S | thunderbird | 140.15.0-1.el9_4 | RHSA-2026:77627 |
| RHEL 9.2 E4S | thunderbird | 140.15.0-1.el9_2 | RHSA-2026:77632 |
| RHEL 8.8 TUS | thunderbird | 140.16.0-1.el8_8 | RHSA-2026:81912 |
| RHEL 8.8 E4S | thunderbird | 140.16.0-1.el8_8 | RHSA-2026:81912 |
| RHEL 8.6 EUS Long Life | thunderbird | 140.16.0-1.el8_6 | RHSA-2026:81913 |
| RHEL 8.6 AUS | thunderbird | 140.16.0-1.el8_6 | RHSA-2026:81913 |
| RHEL 8.4 EUS Long Life | thunderbird | 140.16.0-1.el8_4 | RHSA-2026:82122 |
| RHEL 8.4 AUS | thunderbird | 140.16.0-1.el8_4 | RHSA-2026:82122 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | thunderbird | 140.16.0-1.el10_2.alma.1 | ALSA-2026:73130 |
| AlmaLinux 9 | thunderbird | 140.16.0-1.el9_8.alma.1 | ALSA-2026:70642 |
| AlmaLinux 8 | thunderbird | 140.16.0-1.el8_10.alma.1 | ALSA-2026:73971 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | thunderbird | 140.16.0-1.el10_2 | RLSA-2026:73130 |
| Rocky Linux 9 | thunderbird | 140.16.0-1.el9_8 | RLSA-2026:70642 |
| Rocky Linux 8 | thunderbird | 140.16.0-1.el8_10 | RLSA-2026:73971 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaThunderbird | 153.2.0-150400.13.3.1 | SUSE-SU-2026:4268-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 140.15.0-1.1 | openSUSE-SU-2026:11678-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 140.16.0-1.amzn2.0.1 | ALAS2-2026-3952 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | thunderbird | 140.16.0-1.0.1.el10_2 | ELSA-2026-73130 |
| Oracle Linux 9 | thunderbird | 140.16.0-1.0.1.el9_8 | ELSA-2026-70642 |
| Oracle Linux 8 | thunderbird | 140.16.0-1.0.1.el8_10 | ELSA-2026-73971 |
Advisories 23
- WID-SEC-2026-3132 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- ALSA-2026:73130 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:70642 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:73971 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:82122 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81912 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81913 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:73971 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:73130 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:70642 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:80503 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77631 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77632 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2026:77627 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RLSA-2026:73971 Important: thunderbird security update Rocky Linux Security Advisories · Oct 1, 2026
- ELSA-2026-73971 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 1, 2026
- RLSA-2026:73130 Important: thunderbird security update Rocky Linux Security Advisories · Sep 30, 2026
- ELSA-2026-73130 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Sep 29, 2026
- ALAS2-2026-3952 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 28, 2026
- RLSA-2026:70642 Important: thunderbird security update Rocky Linux Security Advisories · Sep 25, 2026
- ELSA-2026-70642 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Sep 24, 2026
- SUSE-SU-2026:4268-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Sep 19, 2026
- openSUSE-SU-2026:11678-1 MozillaThunderbird-140.15.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 5, 2026