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This Red Hat security advisory addresses a high-severity vulnerability identified as CVE-2026-16365 affecting Thunderbird. The advisory provides a functional equivalent update to a previous Red Hat advisory (RHSA-2026:73971). The vulnerability involves multiple weaknesses related to authorization and memory safety as indicated by associated CWEs. Affected versions include various Thunderbird and Firefox packages on Red Hat Enterprise Linux and SUSE Linux Enterprise distributions. No CVSS score is provided for this vulnerability.

CVE-2026-16365 is a high-severity vulnerability affecting Thunderbird as packaged in Red Hat and SUSE Linux Enterprise distributions. The issue involves multiple weaknesses including improper authorization (CWE-269, CWE-284), use-after-free or memory corruption (CWE-787, CWE-476), and other security flaws (CWE-266, CWE-653, CWE-824, CWE-125, CWE-791, CWE-807, CWE-497, CWE-843). The Red Hat advisory references a functional equivalent update to RHSA-2026:73971, indicating that a security update is available to address these issues. The affected versions include Thunderbird versions prior to 153 and specific package versions such as 140.15.0-1 and 140.16.0-1 across multiple architectures and distributions. No known exploits in the wild have been reported.

Detailed information about Privilege escalation in the DOM: Workers component. (CVE-2026-16365). Get real-time updates, technical details, and mitigation strate

Privilege escalation in the DOM: Workers component. (CVE-2026-16365) - Live Threat Intelligence - Threat Radar | OffSeq.com

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URL of this CSAF notice

SUSE CVE CVE-2026-16365 page

SUSE CVE CVE-2026-75874 page

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SUSE CVE CVE-2026-84145 page

SUSE CVE CVE-2026-84639 page

SUSE CVE CVE-2026-84640 page

SUSE CVE CVE-2026-84641 page

https://access.redhat.com/errata/RHSA-2026:70642

https://access.redhat.com/security/updates/classification/#important

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https://access.redhat.com/errata/RHSA-2026:73130

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URL for RHSA-2026:73130

E-Mail link for RHSA-2026:73130

SUSE CVE CVE-2026-92005 page

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SUSE CVE CVE-2026-92007 page

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URL for RHSA-2026:73971

E-Mail link for RHSA-2026:73971

https://access.redhat.com/errata/RHSA-2026:76894

Canonical URL

https://access.redhat.com/errata/RHSA-2026:76895

https://access.redhat.com/errata/RHSA-2026:77610

https://access.redhat.com/errata/RHSA-2026:80503

https://access.redhat.com/errata/RHSA-2026:82122

Red Hat Security Advisory: thunderbird security update

CVE-2026-84639 is a critical vulnerability in Mozilla Thunderbird where triggering an error condition in certain MIME bodies causes uninitialized memory to be used. This flaw could lead to a high impact on confidentiality and availability. The issue has been fixed in Thunderbird versions 155, 140.15, and 153.2.

This vulnerability involves the use of uninitialized memory when processing specific MIME bodies in Mozilla Thunderbird. Exploiting this flaw could allow an attacker to cause a denial of service or potentially leak sensitive information due to the use of uninitialized memory. The vulnerability is tracked as CWE-457 (Use of Uninitialized Variable). Mozilla has released fixes in Thunderbird versions 155, 140.15, and 153.2 to address this issue.

Detailed information about CVE-2026-84639: Vulnerability in Mozilla Thunderbird affecting Mozilla Thunderbird. Get real-time updates, technical details, and mit

CVE-2026-84639: Vulnerability in Mozilla Thunderbird - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-84639: Vulnerability in Mozilla Thunderbird


Red Hat Security Advisory: thunderbird security updateCVE-2026-16365 0 This Red Hat security advisory addresses a high-severity vulnerability identified as CVE-2026-16365 affecting Thunderbird. The advisory provides a functional equivalent update to a previous Red Hat advisory (RHSA-2026:73971). The vulnerability involves multiple weaknesses related to authorization and memory safety as indicated by associated CWEs. Affected versions include various Thunderbird and Firefox packages on Red Hat Enterprise Linux and SUSE Linux Enterprise distributions. No CVSS score is provided for this vulnerability. HighVulnerability#gcve #osv #ghsa-534q-w7ff-7vh6 Join the discussion	GCVE Database	10/13/2026, 09:04:38 UTC Added: 07/21/2026, 20:06:49 UTC
CVE-2026-84639: Vulnerability in Mozilla ThunderbirdCVE-2026-84639 0 CVE-2026-84639 is a critical vulnerability in Mozilla Thunderbird where triggering an error condition in certain MIME bodies causes uninitialized memory to be used. This flaw could lead to a high impact on confidentiality and availability. The issue has been fixed in Thunderbird versions 155, 140.15, and 153.2. CriticalVulnerability#cve #cve-2026-84639 #gcve Join the discussion	CVE Database V5	09/01/2026, 22:17:00 UTC Added: 09/01/2026, 21:52:45 UTC

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