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CVE-2026-12305

Memory safety bug fixed in Thunderbird 152

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-12301

Memory safety bug fixed in Thunderbird 152

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-12300

Memory safety bug fixed in Thunderbird 152

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-12298

Memory safety bug fixed in Thunderbird 152

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-12290

Memory safety bug fixed in Thunderbird 152

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-16360

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-16412

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

Memory safety bugs present in Thunderbird ESR 140.12 and Thunderbird 152. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-8092

Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thunderbird 150.0.2

Memory safety bugs present in Thunderbird ESR 140.10.1 and Thunderbird 150.0.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-113866

Account password sent unencrypted during Exchange account setup

When setting up an account, Thunderbird's Exchange AutoDiscover lookup also queried the domain's AutoDiscover service over plain HTTP. Due to a bug, that unencrypted request included the credentials the user had entered, allowing a network attacker to obtain the user's password. This vulnerability was fixed in Thunderbird 158.0.1 and Thunderbird 153.5.1.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Thunderbird
CVE-2026-113400

Uninitialized memory in the Audio/Video: cubeb component

Uninitialized memory in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-113401

Denial-of-service in the PDF Viewer component

Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 158.0.1 and Thunderbird 158.0.1.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-110249

Denial-of-service in the Exchange email component

A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. This vulnerability was fixed in Thunderbird 158 and Thunderbird 153.5.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Thunderbird
CVE-2026-109764

Mitigation bypass in the Enterprise Policies component

Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-109762

Incorrect boundary conditions in the SVG component

Incorrect boundary conditions in the SVG component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-109770

Spoofing issue in the DOM: Web Serial component

Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-109750

Site isolation issue in the DOM: Web Authentication component

Site isolation issue in the DOM: Web Authentication component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox
CVE-2026-100798

Cryptography misuse in Storage: Quota Manager component

Cryptography misuse in Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-100799

Uninitialized memory in the Graphics: WebGPU component

Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-100800

Sandbox escape due to use-after-free in the Disability Access APIs component

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-100802

Uninitialized memory in the Graphics: WebGPU component

Uninitialized memory in the Graphics: WebGPU component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird