Improperly Implemented Security Check for Standard Affecting thunderbird package, versions <0:140.13.0-1.el9_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.39% (32nd percentile)

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  • Snyk IDSNYK-RHEL9-THUNDERBIRD-18534872
  • published5 Aug 2026
  • disclosed21 Jul 2026

Introduced: 21 Jul 2026

CVE-2026-16377  (opens in a new tab)
CWE-358  (opens in a new tab)

How to fix?

Upgrade RHEL:9 thunderbird to version 0:140.13.0-1.el9_8 or higher.
This issue was patched in RHSA-2026:49921.

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:9 relevant fixed versions and status.

Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS Base Scores

version 3.1