Encoding Error Affecting thunderbird package, versions *


Severity

Recommended
low

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.61% (48th percentile)

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  • Snyk IDSNYK-RHEL10-THUNDERBIRD-22274010
  • published7 Nov 2026
  • disclosed5 May 2020

Introduced: 5 May 2020

CVE-2020-12397  (opens in a new tab)
CWE-172  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:10 thunderbird.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird < 68.8.0.

CVSS Base Scores

version 3.1