Description
A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 60.7.1 | 60.7.1 |
| Mozilla | Firefox | unspecified – < 67.0.3 | 67.0.3 |
| Mozilla | Thunderbird | unspecified – < 60.7.2 | 60.7.2 |
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 | 60.7.1esr-1 | — |
| Debian 14 | thunderbird | 1:60.7.2-1 | — |
| Debian 13 | firefox-esr | 60.7.1esr-1 | — |
| Debian 13 | thunderbird | 1:60.7.2-1 | — |
| Debian 12 | firefox-esr | 60.7.1esr-1 | — |
| Debian 12 | thunderbird | 1:60.7.2-1 | — |
| Debian 9 | firefox-esr | 60.7.1esr-1~deb9u1 | DSA-4466-1 |
| Debian 9 | thunderbird | 1:60.7.2-1~deb9u1 | DSA-4471-1 |
| Debian 8 | firefox-esr | 60.7.1esr-1~deb8u1 | DLA-1829-1 |
| Debian 8 | thunderbird | 1:60.7.2-1~deb8u1 | DLA-1836-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 67.0.3+build1-0ubuntu0.18.04.1 | USN-4020-1 |
| Ubuntu 18.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:60.7.2+build2-0ubuntu0.18.04.1 | USN-4045-1 |
| Ubuntu 16.04 LTS | firefox | 67.0.3+build1-0ubuntu0.16.04.1 | USN-4020-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.7.2+build2-0ubuntu0.16.04.1 | USN-4045-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox | 60.7.2-3.el8_0 | RHSA-2019:1696 |
| RHEL 8 | thunderbird | 60.7.2-2.el8_0 | RHSA-2019:1623 |
| RHEL 7 | firefox | 60.7.2-1.el7_6 | RHSA-2019:1603 |
| RHEL 7 | thunderbird | 60.7.2-2.el7_6 | RHSA-2019:1626 |
| RHEL 6 | firefox | 60.7.2-1.el6_10 | RHSA-2019:1604 |
| RHEL 6 | thunderbird | 60.7.2-2.el6_10 | RHSA-2019:1624 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 60.7.1-3.45.1 | SUSE-SU-2019:1629-1 |
| SLES 15 SP1 | MozillaThunderbird | 60.7.2-3.43.1 | SUSE-SU-2019:1683-1 |
| SLES 15 | MozillaFirefox | 60.7.1-3.45.1 | SUSE-SU-2019:1629-1 |
| SLES 15 | MozillaThunderbird | 60.7.2-3.43.1 | SUSE-SU-2019:1683-1 |
| SLES 12 SP4 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES 12 SP3 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES 12 SP2 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES 12 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES 11 SP4 | MozillaFirefox | 60.8.0esr-78.43.2 | SUSE-SU-2019:14124-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 60.7.2-85.1 | openSUSE-SU-2019:1664-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.7.1-109.77.1 | SUSE-RU-2019:1625-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 60.7.2-lp151.2.7.1 | openSUSE-SU-2019:1606-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 60.7.2-lp150.3.59.1 | openSUSE-SU-2019:1593-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 60.7.2-lp151.2.7.1 | openSUSE-SU-2019:1606-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.22 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.21 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.20 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.19 | firefox-esr | 60.7.1-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.17 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.16 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.15 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.14 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.13 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.12 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.12 | mozjs60 +1 | 60.7.2-r0 | — |
| Alpine v3.11 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.11 | mozjs60 | 60.7.2-r0 | — |
| Alpine v3.10 | firefox-esr | 60.7.1-r0 | — |
| Alpine v3.10 | mozjs60 | 60.7.2-r0 | — |
| Alpine v3.9 | firefox-esr | 60.7.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 60.7.2-2.amzn2.0.1 | ALAS2-2019-1250 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 60.7.2-3.0.2.el8_0 | ELSA-2019-1696 |
| Oracle Linux 8 | thunderbird | 60.7.2-2.0.1.el8_0 | ELSA-2019-1623 |
| Oracle Linux 7 | firefox | 60.7.2-1.0.1.el7_6 | ELSA-2019-1603 |
| Oracle Linux 7 | thunderbird | 60.7.2-2.0.1.el7_6 | ELSA-2019-1626 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 2
- Mozilla Firefox 67 - Array.pop JIT Type Confusion EDB-50691 · local · Feb 2, 2022
- Mozilla Spidermonkey - IonMonkey 'Array.prototype.pop' Type Confusion EDB-47038 · dos · Jun 26, 2019 · verified
GitHub 4 repositories
-
vigneshsrao/CVE-2019-11707 ★ 42 · Aug 18, 2019
Exploit code for CVE-2019-11707 on Firefox 66.0.3 running on Ubuntu
-
flabbergastedbd/cve-2019-11707 ★ 2 · Apr 13, 2020
https://bugs.chromium.org/p/project-zero/issues/detail?id=1820
-
G4sp4rCS/CVE-2019-11707-from-an-IonMonkey-type-confusion-to-SYSTEM- ★ 0 · Sep 23, 2026
CVE-2019-11707 is a critical type confusion in Firefox's IonMonkey optimizing JIT. The browser bug provides native code execution in the content process, but that process remains constrained by the F…
-
CosminGGeorgescu/CVE-2019-11707-PoC ★ 0 · Jan 29, 2026
Proof of concept for CVE-2019-11707
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 27
- RHSA-2019:1624 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1626 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1604 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1603 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4045-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4020-1 firefox vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4471-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4466-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1829-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1836-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:1629-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14124-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1593-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1664-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1606-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-RU-2019:1625-1 Recommended update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1683-1 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
- RHSA-2019:1623 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jan 14, 2026
- RHSA-2019:1696 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jan 14, 2026
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ELSA-2019-1623 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ELSA-2019-1696 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1250 Critical: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 22, 2019
- ELSA-2019-1626 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 27, 2019
- ELSA-2019-1603 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 26, 2019