Description
An integer overflow can occur during conversion of text to some Unicode character sets due to an unchecked length parameter. This vulnerability affects Firefox ESR < 52.7 and Thunderbird < 52.7.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 52.7 | 52.7 |
| Mozilla | Thunderbird | unspecified – < 52.7 | 52.7 |
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 | 52.7.0esr-1 | — |
| Debian 14 | thunderbird | 1:52.7.0-1 | — |
| Debian 13 | firefox-esr | 52.7.0esr-1 | — |
| Debian 13 | thunderbird | 1:52.7.0-1 | — |
| Debian 12 | firefox-esr | 52.7.0esr-1 | — |
| Debian 12 | thunderbird | 1:52.7.0-1 | — |
| Debian 9 | firefox-esr | 52.7.1esr-1~deb9u1 | DSA-4139-1 |
| Debian 9 | thunderbird | 1:52.7.0-1~deb9u1 | DSA-4155-1 |
| Debian 8 | firefox-esr | 52.7.1esr-1~deb8u1 | DSA-4139-1 |
| Debian 8 | thunderbird | 1:52.7.0-1~deb8u1 | DSA-4155-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | firefox-esr | 52.7.1esr-1~deb7u1 | DLA-1308-1 |
| Debian 7 | thunderbird | 1:52.7.0-1~deb7u1 | DLA-1327-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | thunderbird | 1:52.7.0+build1-0ubuntu1 | — |
| Ubuntu 16.04 LTS | thunderbird | 1:52.7.0+build1-0ubuntu0.16.04.1 | USN-3545-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.7.0+build1-0ubuntu0.14.04.1 | USN-3545-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox +1 | 52.7.0-1.el7_4 | RHSA-2018:0648, RHSA-2018:0527 |
| RHEL 6 | firefox +1 | 52.7.0-1.el6_9 | RHSA-2018:0647, RHSA-2018:0526 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | MozillaFirefox | 52.7.3esr-109.25.1 | SUSE-SU-2018:0850-1 |
| SLES 12 SP2 | MozillaFirefox | 52.7.3esr-109.25.1 | SUSE-SU-2018:0850-1 |
| SLES 11 SP4 | MozillaFirefox | 52.7.3esr-72.27.2 | SUSE-SU-2018:0907-1 |
| SLES 11 SP3 | MozillaFirefox | 52.7.3esr-72.27.2 | SUSE-SU-2018:0907-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | MozillaFirefox | 52.7.3esr-109.25.1 | SUSE-SU-2018:0850-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 52.7.3esr-109.25.1 | SUSE-SU-2018:0850-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 52.7.3esr-72.27.2 | SUSE-SU-2018:0907-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 52.7-57.1 | openSUSE-SU-2018:0819-1, openSUSE-SU-2018:0818-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 52.7.3esr-72.27.2 | SUSE-SU-2018:0907-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox +1 | 52.7.0-1.0.1.el7_4 | ELSA-2018-0648, ELSA-2018-0527 |
Advisories 16
- RHSA-2018:0648 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2018:0647 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2018:0526 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2018:0527 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3545-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4155-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4139-1 firefox-esr - security-update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1327-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1308-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2018:0819-1 Security update for Mozilla Thunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0907-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2018:0818-1 Security update for Mozilla Thunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:0850-1 Security update for MozillaFirefox 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
- ELSA-2018-0648 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 5, 2018
- ELSA-2018-0527 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 15, 2018
References
- DSA-4139 vendor-advisory
- GLSA-201810-01 vendor-advisory
- GLSA-201811-13 vendor-advisory
- RHSA-2018:0527 vendor-advisory
- USN-3545-1 vendor-advisory
- [debian-lts-announce] 20180315 [SECURITY] [DLA 1308-1] firefox-esr security update mailing-list
- https://www.mozilla.org/security/advisories/mfsa2018-09/
- https://www.mozilla.org/security/advisories/mfsa2018-07/
- RHSA-2018:0526 vendor-advisory
- [debian-lts-announce] 20180329 [SECURITY] [DLA 1327-1] thunderbird security update mailing-list
- DSA-4155 vendor-advisory
- RHSA-2018:0648 vendor-advisory
- RHSA-2018:0647 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1440926
- 1040514 vdb-entry
- 103384 vdb-entry