Description
The encrypted subject of an email message could be incorrectly and permanently assigned to an arbitrary other email message in Thunderbird's local cache. Consequently, when replying to the contaminated email message, the user might accidentally leak the confidential subject to a third-party. While this update fixes the bug and avoids future message contamination, it does not automatically repair existing contaminations. Users are advised to use the repair folder functionality, which is available from the context menu of email folders, which will erase incorrect subject assignments. This vulnerability affects Thunderbird < 115.8.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 115.8.1 | 115.8.1 |
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 | thunderbird | 1:115.8.1-1 | — |
| Debian 13 | thunderbird | 1:115.8.1-1 | — |
| Debian 12 | thunderbird | 1:115.9.0-1~deb12u1 | DSA-5644-1 |
| Debian 11 | thunderbird | 1:115.9.0-1~deb11u1 | DSA-5644-1 |
| Debian 10 | thunderbird | 1:115.9.0-1~deb10u1 | DLA-3769-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | thunderbird | 1:115.8.1+build1-0ubuntu0.22.04.1 | USN-6669-1 |
| Ubuntu 20.04 LTS | thunderbird | 1:115.8.1+build1-0ubuntu0.20.04.1 | USN-6669-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | thunderbird | 115.9.0-1.el9_3 | RHSA-2024:1493 |
| RHEL 8 | thunderbird | 115.9.0-1.el8_9 | RHSA-2024:1494 |
| RHEL 7 | thunderbird | 115.9.0-1.el7_9 | RHSA-2024:1498 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | thunderbird | 115.9.0-1.el9_2 | RHSA-2024:1492 |
| RHEL 9.0 EUS | thunderbird | 115.9.0-1.el9_0 | RHSA-2024:1495 |
| RHEL 8.8 EUS | thunderbird | 115.9.0-1.el8_8 | RHSA-2024:1496 |
| RHEL 8.6 EUS | thunderbird | 115.9.0-1.el8_6 | RHSA-2024:1497 |
| RHEL 8.4 TUS | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.4 E4S | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.4 AUS | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.2 TUS | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
| RHEL 8.2 E4S | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
| RHEL 8.2 AUS | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | thunderbird | 115.9.0-1.el9_3.alma.1 | ALSA-2024:1493 |
| AlmaLinux 8 | thunderbird | 115.9.0-1.el8_9.alma.1 | ALSA-2024:1494 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | thunderbird | 115.9.0-1.el8_9 | RLSA-2024:1494 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaThunderbird | 115.8.1-150200.8.151.1 | SUSE-SU-2024:0893-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 115.8.1-1.1 | openSUSE-SU-2024:13753-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.8.1-150200.8.151.1 | SUSE-SU-2024:0893-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.8.1-1.amzn2.0.1 | ALAS2-2024-2497 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | thunderbird | 115.9.0-1.0.1.el9_3 | ELSA-2024-1493 |
| Oracle Linux 8 | thunderbird | 115.9.0-1.0.1.el8_9 | ELSA-2024-1494 |
| Oracle Linux 7 | thunderbird | 115.9.0-1.0.1.el7_9 | ELSA-2024-1498 |
Advisories 22
- ALSA-2024:1493 Moderate: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1494 Moderate: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:1496 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1500 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1499 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1495 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1492 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1494 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1497 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1498 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1493 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- USN-6669-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5644-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3769-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:1494 Moderate: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:13753-1 MozillaThunderbird-115.8.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0893-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0545 Mozilla Thunderbird: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · May 12, 2024
- ELSA-2024-1493 Moderate: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1494 Moderate: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1498 Moderate: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 25, 2024
- ALAS2-2024-2497 Low: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 18, 2024