Description
If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. This vulnerability affects Thunderbird < 78.10.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 78.10.2 | 78.10.2 |
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 | 1:78.10.2-1 | — |
| Debian 13 | thunderbird | 1:78.10.2-1 | — |
| Debian 12 | thunderbird | 1:78.10.2-1 | — |
| Debian 10 | thunderbird | 1:78.11.0-1~deb10u1 | DSA-4927-1 |
| Debian 9 | thunderbird | 1:78.11.0-1~deb9u1 | DLA-2679-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | thunderbird | 1:78.11.0+build1-0ubuntu0.20.04.2 | USN-4995-1 |
| Ubuntu 18.04 LTS | thunderbird | 1:78.11.0+build1-0ubuntu0.18.04.2 | USN-4995-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | thunderbird | 78.11.0-1.el8_4 | RHSA-2021:2264 |
| RHEL 7 | thunderbird | 78.11.0-1.el7_9 | RHSA-2021:2263 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.2 EUS | thunderbird | 78.11.0-1.el8_2 | RHSA-2021:2261 |
| RHEL 8.1 EUS | thunderbird | 78.11.0-1.el8_1 | RHSA-2021:2262 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | thunderbird | 78.11.0-1.el8_4 | RLSA-2021:2264 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | MozillaThunderbird | 78.10.2-8.27.1 | SUSE-SU-2021:1854-1 |
| SLES 15 SP2 | MozillaThunderbird | 78.10.2-8.27.1 | SUSE-SU-2021:1854-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Leap 15.3 | MozillaThunderbird | 78.10.2-8.27.1 | openSUSE-SU-2021:1854-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | thunderbird | 91.3.2-r0 | — |
| Alpine v3.22 | thunderbird | 91.3.2-r0 | — |
| Alpine v3.21 | thunderbird | 91.3.2-r0 | — |
| Alpine v3.20 | thunderbird | 91.3.2-r0 | — |
| Alpine v3.19 | thunderbird | 91.3.2-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | thunderbird | 91.3.2-r0 | — |
| Alpine v3.17 | thunderbird | 91.3.2-r0 | — |
| Alpine v3.16 | thunderbird | 91.3.2-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 78.11.0-1.amzn2.0.1 | ALAS2-2021-1681 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | thunderbird | 78.11.0-1.0.1.el8_4 | ELSA-2021-2264 |
| Oracle Linux 7 | thunderbird | 78.11.0-1.0.1.el7_9 | ELSA-2021-2263 |
Advisories 15
- RHSA-2021:2263 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4995-2 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4995-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4927-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2679-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2021:2264 Important: thunderbird security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2021:1854-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:1854-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2021:2264 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2021:2262 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2021:2261 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2021-1681 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 1, 2021
- ELSA-2021-2264 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 8, 2021
- ELSA-2021-2263 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 8, 2021