Description
Heap-based buffer overflow in the nsCaseTransformTextRunFactory::TransformString function in Mozilla Firefox before 49.0, Firefox ESR 45.x before 45.4, and Thunderbird < 45.4 allows remote attackers to cause a denial of service (boolean out-of-bounds write) or possibly have unspecified other impact via Unicode characters that are mishandled during text conversion.
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 | 49.0+build4-0ubuntu0.16.04.1 | USN-3076-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:45.4.0+build1-0ubuntu0.16.04.1 | USN-3112-1 |
| Ubuntu 14.04 LTS | firefox | 49.0+build4-0ubuntu0.14.04.1 | USN-3076-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:45.4.0+build1-0ubuntu0.14.04.1 | USN-3112-1 |
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 11
- RHSA-2016:1912 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3112-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3076-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 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
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
- http://www.mozilla.org/security/announce/2016/mfsa2016-85.html
- https://www.mozilla.org/security/advisories/mfsa2016-86/
- DSA-3674 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1291016
- GLSA-201701-15 vendor-advisory
- RHSA-2016:1912 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2016-88/
- 93049 vdb-entry
- 1036852 vdb-entry