Amazon Linux 2 Security Advisory: ALAS2-2026-3868
Advisory Released Date: 2026-08-17
Advisory Updated Date: 2026-08-17
FAQs regarding Amazon Linux ALAS/CVE Severity
The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13. (CVE-2026-14899)
Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13. (CVE-2026-16350)
A malicious LDAP server, which a Thunderbird user is configured to query for address-book autocomplete, can stash arbitrarily large amounts of attacker-supplied data into the Thunderbird LDAP client until it crashes due to memory exhaustion. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1. (CVE-2026-57962)
An attacker who can send HTML chat messages (via Matrix or XMPP) can inject arbitrary styled content, phishing links, and CSS that manipulates the chat UI. This vulnerability was fixed in Thunderbird 152.0.1 and Thunderbird 140.12.1. (CVE-2026-57963)
Affected Packages:
thunderbird
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update thunderbird or yum update --advisory ALAS2-2026-3868 to update your system.
aarch64:
thunderbird-140.13.0-1.amzn2.0.1.aarch64
src:
thunderbird-140.13.0-1.amzn2.0.1.src
x86_64:
thunderbird-140.13.0-1.amzn2.0.1.x86_64