# CVE-2018-5178: thunderbird: A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts o...

CVE-2018-5178 is fixed in 8 products on 1 platform, first by thunderbird 1:52.8.0+build1-0ubuntu0.18.04.1, released May 22, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-5178
- Priority: Routine
- CVSS: n/a (Low)
- EPSS: 0.0489
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 9, 2018

## Description

A buffer overflow was found during UTF8 to Unicode string conversion within JavaScript with extremely large amounts of data. This vulnerability requires the use of a malicious or vulnerable legacy extension in order to occur. This vulnerability affects Thunderbird ESR < 52.8, Thunderbird < 52.8, and Firefox ESR < 52.8.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [thunderbird 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | thunderbird-globalmenu Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [thunderbird-globalmenu 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-globalmenu-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | thunderbird-testsuite Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [thunderbird-testsuite 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-testsuite-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |
| Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:52.8.0+build1-0ubuntu0.18.04.1 | [xul-ext-lightning 1:52.8.0+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-52.8.0-build1-0ubuntu0.18.04.1.md) | May 22, 2018 |

---

Data as of 2026-11-13T20:04:13Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.