Description
In the previous mitigations for Spectre, the resolution or precision of various methods was reduced to counteract the ability to measure precise time intervals. In that work PerformanceNavigationTiming was not adjusted but it was found that it could be used as a precision timer. This vulnerability affects Thunderbird < 60, Firefox ESR < 60.1, and Firefox < 61.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 60 | 60 |
| Mozilla | Firefox ESR | unspecified – < 60.1 | 60.1 |
| Mozilla | Firefox | unspecified – < 61 | 61 |
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 | 1:60.0-1 | — |
| Debian 13 | thunderbird | 1:60.0-1 | — |
| Debian 12 | thunderbird | 1:60.0-1 | — |
| Debian 9 | thunderbird | 1:60.0-3~deb9u1 | DSA-4295-1 |
| Debian 8 | thunderbird | 1:60.3.0-1~deb8u1 | DLA-1575-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | firefox | 61.0+build3-0ubuntu0.18.04.1 | USN-3705-1 |
| Ubuntu 16.04 LTS | firefox | 61.0+build3-0ubuntu0.16.04.2 | USN-3705-1 |
| Ubuntu 14.04 LTS | firefox | 61.0+build3-0ubuntu0.14.04.2 | USN-3705-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | MozillaThunderbird | 60.2.1-3.13.1 | SUSE-SU-2018:3247-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | MozillaThunderbird | 60.3.0-74.2 | openSUSE-SU-2018:3687-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 8
- USN-3705-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4295-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1575-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:3247-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2018:3687-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media 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
- GLSA-201810-01 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-15/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1462891
- [debian-lts-announce] 20181112 [SECURITY] [DLA 1575-1] thunderbird security update mailing-list
- GLSA-201811-13 vendor-advisory
- DSA-4295 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-16/
- 1041193 vdb-entry
- https://www.mozilla.org/security/advisories/mfsa2018-19/
- USN-3705-1 vendor-advisory
- 104561 vdb-entry