Description
A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird < 68.1.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 68.1.1 | 68.1.1 |
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 | 1:68.2.1-1 | — |
| Debian 13 | thunderbird | 1:68.2.1-1 | — |
| Debian 12 | thunderbird | 1:68.2.1-1 | — |
| Debian 10 | thunderbird | 1:68.2.2-1~deb10u1 | DSA-4571-1 |
| Debian 9 | thunderbird | 1:68.2.2-1~deb9u1 | DSA-4571-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | thunderbird | 1:68.2.2-1~deb8u1 | DLA-1997-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | thunderbird | 1:68.2.1+build1-0ubuntu0.18.04.1 | USN-4202-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.16.04.2 | USN-4335-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaThunderbird | 68.1.1-3.51.1 | SUSE-SU-2019:2515-1 |
| SLES 15 | MozillaThunderbird | 68.1.1-3.51.1 | SUSE-SU-2019:2515-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.1.1-lp151.2.13.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.1 | enigmail | 2.1.2-lp151.2.6.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 68.1.1-lp150.3.51.1 | openSUSE-SU-2019:2248-1 |
| openSUSE Leap 15.0 | enigmail | 2.1.2-lp150.34.1 | openSUSE-SU-2019:2248-1 |
Advisories 8
- USN-4202-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4335-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-4571-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1997-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:2249-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2248-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2515-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1240290
- https://www.mozilla.org/security/advisories/mfsa2019-32/
- openSUSE-SU-2019:2248 vendor-advisory
- openSUSE-SU-2019:2249 vendor-advisory
- 20191118 [SECURITY] [DSA 4571-1] thunderbird security update mailing-list
- DSA-4571 vendor-advisory
- [debian-lts-announce] 20191118 [SECURITY] [DLA 1997-1] thunderbird security update mailing-list
- USN-4202-1 vendor-advisory
- USN-4335-1 vendor-advisory