Description
Use-after-free vulnerability in the SetBreaks function in Mozilla Firefox before 38.0, Firefox ESR 31.x before 31.7, and Thunderbird before 31.7 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via a document containing crafted text in conjunction with a Cascading Style Sheets (CSS) token sequence containing properties related to vertical text.
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 8 | icedove | 31.7.0-1~deb8u1 | DSA-3264-1 |
| Debian 8 | iceweasel | 31.7.0esr-1~deb8u1 | DSA-3260-1 |
| Debian 7 | icedove | 31.7.0-1~deb7u1 | DSA-3264-1 |
| Debian 7 | iceweasel | 31.7.0esr-1~deb7u1 | DSA-3260-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | firefox | 38.0+build3-0ubuntu0.14.04.1 | USN-2602-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:31.7.0+build1-0ubuntu0.14.04.1 | USN-2603-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 38.0-3.el7_1 | RHSA-2015:0988 |
| RHEL 7 | thunderbird | 31.7.0-1.ael7b_1 | RHSA-2015:1012 |
| RHEL 6 | firefox | 38.0-4.el6_6 | RHSA-2015:0988 |
| RHEL 6 | thunderbird | 31.7.0-1.el6_6 | RHSA-2015:1012 |
| RHEL 5 | firefox | 38.0-4.el5_11 | RHSA-2015:0988 |
| RHEL 5 | thunderbird | 31.7.0-1.el5_11 | RHSA-2015:1012 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Rhel Productivity 5 | thunderbird | 31.7.0-1.el5_11 | RHSA-2015:1012 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 31.7.0esr-34.1 | SUSE-SU-2015:0960-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | MozillaFirefox | 31.7.0esr-34.1 | SUSE-SU-2015:0960-1 |
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 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 38.0-4.0.1.el6_6 | ELSA-2015-0988 |
| Oracle Linux 7 | thunderbird | 31.7.0-1.0.1.el7_1 | ELSA-2015-1012 |
Advisories 12
- RHSA-2015:0988 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Aug 1, 2026
- RHSA-2015:1012 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-2603-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-2602-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3260-1 iceweasel - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3264-1 icedove - 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-2015:0960-1 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-2015-1012 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 19, 2015
- ELSA-2015-0988 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · May 13, 2015
References
- USN-2602-1 vendor-advisory
- RHSA-2015:0988 vendor-advisory
- https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird31.7
- 74611 vdb-entry
- openSUSE-SU-2015:0892 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1153478
- http://www.mozilla.org/security/announce/2015/mfsa2015-51.html
- DSA-3264 vendor-advisory
- DSA-3260 vendor-advisory
- SUSE-SU-2015:0978 vendor-advisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- openSUSE-SU-2015:0934 vendor-advisory
- USN-2603-1 vendor-advisory
- SUSE-SU-2015:0960 vendor-advisory
- RHSA-2015:1012 vendor-advisory
- openSUSE-SU-2015:1266 vendor-advisory
- GLSA-201605-06 vendor-advisory