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Mozilla Firefox ESR12 vulnerabilities

Risk 42
Severity
9

Security Vulnerabilities fixed in Firefox ESR 115.38

First published (updated )
Advisory
MFSA2026-69

Incorrect boundary conditions in the Audio/Video: GMP component

Risk 66
Severity
9.1
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16359

Incorrect boundary conditions in the Audio/Video: cubeb component

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16350

JIT miscompilation in the JavaScript Engine: JIT component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16355

Invalid pointer in the DOM: Bindings (WebIDL) component

Risk 86
Severity
9.8
Use After Free, Null Pointer Dereference
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Invalid pointer in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16353

Incorrect boundary conditions in the Graphics component

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16357

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

Risk 86
Severity
9.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16356

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 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.

1 / 4
Source: Mozilla
First published (updated )
CVE-2026-16360

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

Risk 86
Severity
9.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16352

Memory safety bugs fixed in Thunderbird ESR 140.13

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. 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.

1 / 3
Source: Mozilla
First published (updated )
CVE-2026-16361

Site isolation issue in the Graphics: WebRender component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16358

Sandbox escape due to use-after-free in the DOM: Navigation component

Risk 86
Severity
9.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16351

Same-origin policy bypass in the DOM: Navigation component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16349

Mozilla Firefox ESR22 vulnerabilities

Risk 42
Severity
9

Security Vulnerabilities fixed in Firefox ESR 140.13

First published (updated )
Advisory
MFSA2026-70

Incorrect boundary conditions in the Audio/Video: GMP component

Risk 66
Severity
9.1
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Incorrect boundary conditions in the Audio/Video: GMP component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16359

Incorrect boundary conditions in the Audio/Video: cubeb component

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Incorrect boundary conditions in the Audio/Video: cubeb component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16350

JIT miscompilation in the JavaScript Engine: JIT component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16355

Incorrect boundary conditions in the JavaScript: WebAssembly component

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Incorrect boundary conditions in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16368

Invalid pointer in the DOM: Bindings (WebIDL) component

Risk 86
Severity
9.8
Use After Free, Null Pointer Dereference
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Invalid pointer in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16353

Incorrect boundary conditions in the Graphics component

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16357

JIT miscompilation in the JavaScript: WebAssembly component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16363

Integer overflow in the JavaScript: WebAssembly component

Risk 86
Severity
9.8
Integer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Integer overflow in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16369

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

Risk 86
Severity
9.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16356

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Memory safety bugs present in Firefox ESR 115.37, Firefox ESR 140.12 and Firefox 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.

1 / 4
Source: Mozilla
First published (updated )
CVE-2026-16360

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

Risk 86
Severity
9.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16352

Memory safety bugs fixed in Thunderbird ESR 140.13

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Memory safety bugs present in Firefox ESR 115.37 and Firefox ESR 140.12. 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.

1 / 3
Source: Mozilla
First published (updated )
CVE-2026-16361

Site isolation issue in the Graphics: WebRender component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Site isolation issue in the Graphics: WebRender component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16358

Sandbox escape due to use-after-free in the DOM: Navigation component

Risk 86
Severity
9.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16351

Same-origin policy bypass in the DOM: Navigation component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16349

Mitigation bypass in the PDF Viewer component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation bypass in the PDF Viewer component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16377

Mitigation bypass in the DOM: Networking component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16383

Site isolation issue in the Networking: HTTP component

Risk 86
Severity
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16375

Same-origin policy bypass in the Networking: DNS component

Risk 66
Severity
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Same-origin policy bypass in the Networking: DNS component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16381

Site isolation issue in the Networking component

Risk 86
Severity
9.8
Infoleak
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16387

Mitigation bypass in the Enterprise Policies component

Risk 66
Severity
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the Enterprise Policies component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

First published (updated )
CVE-2026-16390

Memory safety bugs fixed in Thunderbird ESR 140.13 and Thunderbird 153

Risk 86
Severity
9.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Memory safety bugs present in Firefox ESR 140.12 and Firefox 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.

1 / 4
Source: Mozilla
First published (updated )
CVE-2026-16412

Mozilla Firefox ESRSandbox escape in the Security: Process Sandboxing component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

First published (updated )
CVE-2026-12296

Mozilla Firefox ESRSandbox escape due to incorrect boundary conditions in the Networking component

Risk 80
Severity
9.6
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

First published (updated )
CVE-2026-12297

Mozilla Firefox ESRSame-origin policy bypass in the Networking: Cookies component

Risk 66
Severity
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

First published (updated )
CVE-2026-12304
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Mozilla Firefox ESRSandbox escape in the DOM: Workers component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

First published (updated )
CVE-2026-12294

Mozilla Firefox ESRMitigation bypass in the DOM: Security component

Risk 66
Severity
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

First published (updated )
CVE-2026-12315

Mozilla Firefox ESRSandbox escape in the DOM: Navigation component

Risk 80
Severity
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

First published (updated )
CVE-2026-12295

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