Description
Integer overflow in the WebSocketChannel class in the WebSockets subsystem in Mozilla Firefox before 48.0 and Firefox ESR < 45.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets that trigger incorrect buffer-resize operations during buffering.
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 | 45.4.0esr-1 | — |
| Debian 13 | firefox-esr | 45.4.0esr-1 | — |
| Debian 12 | firefox-esr | 45.4.0esr-1 | — |
| Debian 8 | firefox-esr | 45.4.0esr-1~deb8u2 | DSA-3674-1 |
| Debian 7 | firefox-esr | 45.4.0esr-1~deb7u1 | DLA-636-1 |
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 | 45.4.0-1.el7_2 | RHSA-2016:1912 |
| RHEL 6 | firefox | 45.4.0-1.el6_8 | RHSA-2016:1912 |
| RHEL 5 | firefox | 45.4.0-1.el5_11 | RHSA-2016:1912 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | MozillaFirefox | 45.4.0esr-81.1 | SUSE-SU-2016:2434-1 |
| SLES 12 | MozillaFirefox | 45.4.0esr-81.1 | SUSE-SU-2016:2434-1 |
| SLES 11 SP4 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
| SLES 11 SP3 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
| SLES 11 SP2 | MozillaFirefox | 45.4.0esr-52.1 | SUSE-SU-2016:2431-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | MozillaFirefox | 45.4.0esr-81.1 | SUSE-SU-2016:2434-1 |
| SLES for SAP 12 | MozillaFirefox | 45.4.0esr-81.1 | SUSE-SU-2016:2434-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
| SUSE OpenStack Cloud 5 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
| SUSE Manager Proxy 2.1 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
| SUSE Manager 2.1 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 45.4.0esr-53.1 | SUSE-SU-2016:2513-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 45.4.0-1.0.1.el7_2 | ELSA-2016-1912 |
Advisories 10
- RHSA-2016:1912 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-636-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3674-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2016:2513-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2434-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:2431-1 Security update for MozillaFirefox 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
- ELSA-2016-1912 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 21, 2016
References
- 1036508 vdb-entry
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
- https://www.mozilla.org/security/advisories/mfsa2016-86/
- USN-3044-1 vendor-advisory
- DSA-3674 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1287266
- 92260 vdb-entry
- GLSA-201701-15 vendor-advisory
- RHSA-2016:1912 vendor-advisory
- http://www.mozilla.org/security/announce/2016/mfsa2016-75.html
- openSUSE-SU-2016:1964 vendor-advisory
- openSUSE-SU-2016:2026 vendor-advisory