Description
A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in icalmemory_strdup_and_dequote when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 60.7.1 | 60.7.1 |
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 | thunderbird | 1:60.7.1-1 | — |
| Debian 13 | thunderbird | 1:60.7.1-1 | — |
| Debian 12 | thunderbird | 1:60.7.1-1 | — |
| Debian 9 | thunderbird | 1:60.7.1-1~deb9u1 | DSA-4464-1 |
| Debian 8 | thunderbird | 1:60.7.1-1~deb8u1 | DLA-1820-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | thunderbird | 1:60.7.1+build1-0ubuntu0.18.04.1 | USN-4028-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.7.1+build1-0ubuntu0.16.04.1 | USN-4028-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | thunderbird | 60.7.2-2.el8_0 | RHSA-2019:1623 |
| RHEL 7 | thunderbird | 60.7.2-2.el7_6 | RHSA-2019:1626 |
| RHEL 6 | thunderbird | 60.7.2-2.el6_10 | RHSA-2019:1624 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaThunderbird | 60.7.0-3.36.1 | SUSE-SU-2019:1683-1, SUSE-SU-2019:1495-1 |
| SLES 15 | MozillaThunderbird | 60.7.0-3.36.1 | SUSE-SU-2019:1683-1, SUSE-SU-2019:1495-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | MozillaThunderbird | 60.7.2-85.1 | openSUSE-SU-2019:1664-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 60.7.0-lp151.2.4.1 | openSUSE-SU-2019:1606-1, openSUSE-SU-2019:1583-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 60.7.0-lp151.2.4.1 | openSUSE-SU-2019:1606-1, openSUSE-SU-2019:1583-1 |
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 | thunderbird | 60.7.2-2.0.1.el8_0 | ELSA-2019-1623 |
| 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.
Exploit-DB 1
- Thunderbird ESR < 60.7.XXX - 'icalmemorystrdupanddequote' Heap-Based Buffer Overflow EDB-47002 · dos · Jun 17, 2019
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 15
- 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
- USN-4028-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4464-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1820-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 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
- openSUSE-SU-2019:1583-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1495-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1683-1 Security update for MozillaThunderbird 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
- 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
- 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