# RHSA-2020:5398: thunderbird security update

RHSA-2020:5398, released December 14, 2020, fixes 1 CVE in thunderbird (version 0:78.5.1-1.el8_3). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2020-5398
- Platform: Linux
- Released: Dec 14, 2020
- Priority: High (Closes CVE-2020-26970, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2020:5398

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:78.5.1-1.el8_3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-26970](https://patchblox.com/security/data/cve/CVE-2020-26970.md) | High | Thunderbird: When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack… | 8.8 | 0.0125 |  |

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Data as of 2026-11-07T06:34:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo