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Mozilla Firefox ESRUse-after-free in the Layout: Text and Fonts component

Risk 77
Severity
8.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100784

Mozilla Firefox ESRUse-after-free in the Graphics: Canvas2D component

Risk 77
Severity
8.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 140.17, Thunderbird 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100832

Mozilla Firefox ESRPrivilege escalation in the Address Bar component

Risk 77
Severity
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation in the Address Bar component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100820

Mozilla Firefox ESRPrivilege escalation due to incorrect boundary conditions in the Graphics component

Risk 77
Severity
8.8
Buffer Overflow
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100782

Mozilla Firefox ESRUse-after-free in the DOM: Core & HTML component

Risk 77
Severity
8.8
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100785

Mozilla FirefoxPrivilege escalation in the WebExtensions component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92015

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92013

Mozilla FirefoxPrivilege escalation in the DOM: Service Workers component

Risk 56
Severity
8.8
EPSS
0.25%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation in the DOM: Service Workers component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92017

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.34%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92006

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92010

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92007

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92009

Mozilla FirefoxUse-after-free in the Disability Access APIs component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92016

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92012

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: WebRender component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92020

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92011

Mozilla FirefoxPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component

Risk 56
Severity
8.8
EPSS
0.27%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92008

Mozilla FirefoxUse-after-free in the DOM: HTML Parser component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the DOM: HTML Parser component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92022

Mozilla FirefoxUse-after-free in the XML component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92023

Mozilla FirefoxUse-after-free in the DOM: Streams component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the DOM: Streams component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92027

Mozilla FirefoxUse-after-free in the SVG component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the SVG component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92024

Mozilla FirefoxUse-after-free in the SVG component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the SVG component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92029

Mozilla FirefoxUse-after-free in the Networking component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92026

Mozilla FirefoxUse-after-free in the DOM: Navigation component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92025

Mozilla FirefoxUse-after-free in the DOM: Core & HTML component

Risk 56
Severity
8.8
EPSS
0.16%
Use After Free
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92028

Mozilla FirefoxMitigation bypass in the Remote Settings Client component

Risk 42
Severity
8.1
EPSS
0.16%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.

First published (updated )
CVE-2026-92019

ThunderbirdBuffer overrun in IMAP

Risk 42
Severity
8.1
EPSS
0.18%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

A maliciously constructed IMAP line could cause an out-of-bounds buffer read.

1 / 2
Source: Mozilla
First published (updated )
CVE-2026-92239

Mozilla FirefoxPrivilege escalation due to invalid pointer in the Graphics component

Risk 77
Severity
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

First published (updated )
CVE-2026-84131

Mozilla FirefoxInternally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15

Risk 69
Severity
7.5
Buffer Overflow
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Internally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR 115.39. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.

1 / 3
Source: Mozilla
First published (updated )
CVE-2026-84145

Mozilla ThunderbirdOne byte overflow read in mail parser

Risk 43
Severity
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

A maliciously constructed mail header could lead to a one byte read past the end of a buffer.

1 / 2
Source: Mozilla
First published (updated )
CVE-2026-84640

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