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CVE-2026-4698

JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2024-4367

Mozilla: Arbitrary JavaScript execution in PDF.js

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

CVSS 3.1 · 5.6 Medium EPSS 70.7% KEV · Not listed
Vendors
Debian Mozilla Open-xchange and 1 more
Products
Debian Linux Firefox Firefox Esr and 7 more
CVE-2025-14323

Privilege escalation in the DOM: Notifications component

Privilege escalation in the DOM: Notifications component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2026-2781

Integer overflow in the Libraries component in NSS

Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, Thunderbird 140.8, and Firefox ESR 115.35.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2025-8027

JavaScript engine only wrote partial return value to stack

On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 1 more
CVE-2026-2791

Mitigation bypass in the Networking: Cache component

Mitigation bypass in the Networking: Cache 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-2026-2788

Incorrect boundary conditions in the Audio/Video: GMP component

Incorrect boundary conditions in the Audio/Video: GMP 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-2025-6426

No warning when opening executable terminal files on macOS

The executable file warning did not warn users before opening files with the `terminal` extension. *This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Apple Mozilla
Products
Macos Firefox Firefox Esr
CVE-2025-8036

DNS rebinding circumvents CORS

Thunderbird cached CORS preflight responses across IP address changes. This allowed circumventing CORS with DNS rebinding. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2025-8034

Memory safety bugs fixed in Firefox ESR 115.26, Firefox ESR 128.13, Thunderbird ESR 128.13, Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141 and Thunderbird 141

Memory safety bugs present in Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird ESR 128.12, Firefox ESR 140.0, Thunderbird ESR 140.0, Firefox 140 and Thunderbird 140. 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 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Thunderbird and 1 more
CVE-2025-13012

Race condition in the Graphics component

Race condition in the Graphics component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Firefox ESR 115.30, Thunderbird 145, and Thunderbird 140.5.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2025-13017

Same-origin policy bypass in the DOM: Notifications component

Same-origin policy bypass in the DOM: Notifications component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2025-13019

Same-origin policy bypass in the DOM: Workers component

Same-origin policy bypass in the DOM: Workers component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2025-13020

Use-after-free in the WebRTC: Audio/Video component

Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr
CVE-2025-14321

Use-after-free in the WebRTC: Signaling component

Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2025-14325

JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2025-14328

Privilege escalation in the Netmonitor component

Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2025-14330

JIT miscompilation in the JavaScript Engine: JIT component

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Vendors
Mozilla
Products
Firefox Firefox Esr Thunderbird
CVE-2025-6424

Use-after-free in FontFaceSet

A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS 3.1 · 9.8 Critical EPSS 7.9% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Enterprise Linux and 5 more
CVE-2025-6429

Incorrect parsing of URLs could have allowed embedding of youtube.com

Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Mozilla Redhat
Products
Firefox Firefox Esr Enterprise Linux and 5 more