CVE-2026-74988

Public on 2026-08-18

Modified on 2026-08-22

Description

Internally found bugs present in Thunderbird ESR 153.0 and Thunderbird 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Severity

Important

See what this means

CVSS v3 Base Score

8.8

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Firefox Extra	firefox	Pending Fix
Amazon Linux 2023	firefox	Pending Fix
Amazon Linux 2 - Firefox Extra	firefox-amzn-policies-generic	Not Affected
Amazon Linux 2 - Core	thunderbird	Pending Fix

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-74988 Mitre: CVE-2026-74988