Firefox Service Worker UAF Sandbox Escape (CVE-2026-124900)
CVE-2026-124900 Published on November 10, 2026

Sandbox escape due to use-after-free in the DOM: Service Workers component
Sandbox escape due to use-after-free in the DOM: Service Workers component. This vulnerability was fixed in Firefox 160.

NVD

Vulnerability Analysis

CVE-2026-124900 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Exploitation:
NONE
Automatable:
NO
Technical Impact:
TOTAL
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
CHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2026-124900 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2026-124900

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Mozilla Firefox

Affected Versions

Mozilla Firefox: