Description
A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | — | 140.16 |
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 | 1:153.3.0esr-1 | — |
| Debian 13 | thunderbird | 1:140.16.0esr-1~deb13u1 | — |
| Debian 12 | thunderbird | 1:140.16.0esr-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 | 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 | 140.16.0-1.el10_0 | RHSA-2026:81392 |
| RHEL 9.6 EUS | thunderbird | 140.16.0-1.el9_6 | RHSA-2026:81884 |
| RHEL 9.4 E4S | thunderbird | 140.16.0-1.el9_4 | RHSA-2026:81393 |
| RHEL 9.2 E4S | thunderbird | 140.16.0-1.el9_2 | RHSA-2026:81394 |
| 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 | 153.4.0-150400.13.6.1 | SUSE-SU-2026:4627-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 140.16.0-1.1 | openSUSE-SU-2026:11827-1 |
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-2026-3375 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-2026:81884 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81394 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81393 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Oct 16, 2026
- RHSA-2026:81392 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
- SUSE-SU-2026:4627-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Oct 13, 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
- openSUSE-SU-2026:11827-1 MozillaThunderbird-140.16.0-1.1 on GA media SUSE / openSUSE Security Updates · Sep 22, 2026