Description
Use-after-free vulnerability in the CanonicalizeXPCOMParticipant function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 allows remote attackers to execute arbitrary code via a script that closes its own Service Worker within a nested sync event loop.
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 | firefox-esr | 45.3.0esr-1 | — |
| Debian 13 | firefox-esr | 45.3.0esr-1 | — |
| Debian 12 | firefox-esr | 45.3.0esr-1 | — |
| Debian 8 | firefox-esr | 45.3.0esr-1~deb8u1 | DSA-3640-1 |
| Debian 7 | firefox-esr | 45.3.0esr-1~deb7u1 | DLA-585-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | firefox | 48.0+build2-0ubuntu0.16.04.1 | USN-3044-1 |
| Ubuntu 14.04 LTS | firefox | 48.0+build2-0ubuntu0.14.04.1 | USN-3044-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 45.3.0-1.el7_2 | RHSA-2016:1551 |
| RHEL 6 | firefox | 45.3.0-1.el6_8 | RHSA-2016:1551 |
| RHEL 5 | firefox | 45.3.0-1.el5_11 | RHSA-2016:1551 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2016:2131-1 |
| SLES 12 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2016:2131-1 |
| SLES 11 SP4 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SLES 11 SP3 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SLES 11 SP2 | MozillaFirefox | 45.3.0esr-48.1 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | MozillaFirefox-branding-SLED | 45.0-20.38 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | firefox-fontconfig | 2.11.0-4.2 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | mozilla-nspr | 4.12-25.2 | SUSE-SU-2016:2061-1 |
| SLES 11 SP2 | mozilla-nss | 3.21.1-26.2 | SUSE-SU-2016:2061-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2016:2131-1 |
| SLES for SAP 12 | MozillaFirefox | 45.3.0esr-78.1 | SUSE-SU-2016:2131-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 45.3.0-9.1 | openSUSE-SU-2016:2254-1, openSUSE-SU-2016:2253-1 |
| SUSE OpenStack Cloud 5 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Manager Proxy 2.1 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Manager 2.1 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 45.3.0esr-50.1 | SUSE-SU-2016:2195-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 45.5.1-1.1 | openSUSE-SU-2024:10230-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 12
- RHSA-2016:1551 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3044-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-585-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3640-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10230-1 MozillaThunderbird-45.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2061-1 Security update for MozillaFirefox, MozillaFirefox-branding-SLED, mozilla-nspr and mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2016:2254-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2131-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2195-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2016:2253-1 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-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- DSA-3640 vendor-advisory
- 1036508 vdb-entry
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- USN-3044-1 vendor-advisory
- 92258 vdb-entry
- RHSA-2016:1551 vendor-advisory
- GLSA-201701-15 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1282992
- openSUSE-SU-2016:1964 vendor-advisory
- openSUSE-SU-2016:2026 vendor-advisory
- http://www.mozilla.org/security/announce/2016/mfsa2016-73.html