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Mozilla Firefox ESRUndefined behavior in the DOM: Streams component

Risk 59
Severity
8.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Undefined behavior in the DOM: Streams 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-2026-100771

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, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100772

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-2026-100774

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 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

First published (updated )
CVE-2026-100777

Mozilla Firefox ESRUse-after-free in the XSLT 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 XSLT 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-2026-100779

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-2026-100780

Mozilla FirefoxPrivilege escalation in the Shell Integration 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 Shell Integration component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

First published (updated )
CVE-2026-74965

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