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CVE-2026-2777

Privilege escalation in the Messaging System component

Privilege escalation in the Messaging System component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0878

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0879

Sandbox escape due to incorrect boundary conditions in the Graphics component

Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0880

Sandbox escape due to integer overflow in the Graphics component

Sandbox escape due to integer overflow in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0881

Sandbox escape in the Messaging System component

Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

CVSS 3.1 · 10 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-0882

Use-after-free in the IPC component

Use-after-free in the IPC component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0883

Information disclosure in the Networking component

Information disclosure in the Networking component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0884

Use-after-free in the JavaScript Engine component

Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0886

Incorrect boundary conditions in the Graphics component

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0887

Clickjacking issue, information disclosure in the PDF Viewer component

Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0888

Information disclosure in the XML component

Information disclosure in the XML component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-0889

Denial-of-service in the DOM: Service Workers component

Denial-of-service in the DOM: Service Workers component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-0890

Spoofing issue in the DOM: Copy & Paste and Drag & Drop component

Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0891

Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147

Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. 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 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird and 1 more
CVE-2026-0892

Memory safety bugs fixed in Firefox 147 and Thunderbird 147

Memory safety bugs present in Firefox 146 and Thunderbird 146. 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 147 and Thunderbird 147.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Thunderbird
CVE-2026-2762

Integer overflow in the JavaScript: Standard Library component

Integer overflow in the JavaScript: Standard Library component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-2767

Use-after-free in the JavaScript: WebAssembly component

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-0818

CSS-based exfiltration of the content from partially encrypted emails when allowing remote content

When a user explicitly requested Thunderbird to decrypt an inline OpenPGP message that was embedded in a text section of an email that was formatted and styled with HTML and CSS, then the decrypted contents were rendered in a context in which the CSS styles from the outer messages were active. If the user had additionally allowed loading of the remote content referenced by the outer email message, and the email was crafted by the sender using a combination of CSS rules and fonts and animations, then it was possible to extract the secret contents of the email. This vulnerability was fixed in Thunderbird 147.0.1 and Thunderbird 140.7.1.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Thunderbird
CVE-2026-2447

Heap buffer overflow in libvpx

Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-2757

Incorrect boundary conditions in the WebRTC: Audio/Video component

Incorrect boundary conditions in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird