Description
By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux; similar behavior has been observed on Windows as well. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | — | 128.9.2 |
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 | thunderbird | 1:128.10.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.10.0esr-1 | — |
| Debian 12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DSA-5912-1 |
| Debian 11 | thunderbird | 1:128.10.1esr-1~deb11u1 | DLA-4167-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | thunderbird | 128.10.0-1.el10_0 | RHSA-2025:7507 |
| RHEL 9 | thunderbird | 128.9.2-1.el9_5 | RHSA-2025:7435, RHSA-2025:4229 |
| RHEL 8 | thunderbird | 128.9.2-1.el8_10 | RHSA-2025:4649 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | thunderbird | 128.9.2-1.el9_4 | RHSA-2025:4512 |
| RHEL 9.2 EUS | thunderbird | 128.9.2-1.el9_2 | RHSA-2025:4513 |
| RHEL 9.0 E4S | thunderbird | 128.9.2-1.el9_0 | RHSA-2025:4514 |
| RHEL 8.8 EUS | thunderbird | 128.9.2-1.el8_8 | RHSA-2025:4617 |
| RHEL 8.6 TUS | thunderbird | 128.9.2-1.el8_6 | RHSA-2025:4665 |
| RHEL 8.6 E4S | thunderbird | 128.9.2-1.el8_6 | RHSA-2025:4665 |
| RHEL 8.6 AUS | thunderbird | 128.9.2-1.el8_6 | RHSA-2025:4665 |
| RHEL 8.4 TUS | thunderbird | 128.9.2-1.el8_4 | RHSA-2025:4654 |
| RHEL 8.4 E4S | thunderbird | 128.9.2-1.el8_4 | RHSA-2025:4654 |
| RHEL 8.4 AUS | thunderbird | 128.9.2-1.el8_4 | RHSA-2025:4654 |
| RHEL 8.2 AUS | thunderbird | 128.9.2-1.el8_2 | RHSA-2025:4389 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux 9 | thunderbird | 128.9.2-1.el9_5.alma.1 | ALSA-2025:7435, ALSA-2025:4229 |
| AlmaLinux 8 | thunderbird | 128.9.2-1.el8_10.alma.1 | ALSA-2025:4649 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | thunderbird | 128.10.0-1.el9_5 | RLSA-2025:7435 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaThunderbird | 128.9.2-150200.8.209.1 | SUSE-SU-2025:1366-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 128.9.2-1.1 | openSUSE-SU-2025:15000-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.9.2-150200.8.209.1 | SUSE-SU-2025:1366-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 128.10.0-1.amzn2.0.1 | ALAS2-2025-2858 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | thunderbird | 128.11.0-1.0.1.el10_0 | ELSA-2025-7507 |
| Oracle Linux 9 | thunderbird | 128.9.2-1.0.1.el9_5 | ELSA-2025-7435, ELSA-2025-4229 |
| Oracle Linux 8 | thunderbird | 128.9.2-1.0.1.el8_10 | ELSA-2025-4649 |
Advisories 27
- ALSA-2025:7507 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7435 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4229 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4649 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:4649 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:7507 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7435 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4665 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4654 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4617 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4514 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4512 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4513 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4389 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4229 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5912-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4167-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:15000-1 MozillaThunderbird-128.9.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1366-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2025-2858 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 29, 2025
- RLSA-2025:7435 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- WID-SEC-2025-0803 Mozilla Thunderbird und Thunderbird ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2025
- ELSA-2025-7507 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-7435 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 22, 2025
- ELSA-2025-4649 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 7, 2025
- ELSA-2025-4229 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 28, 2025