Mozilla Firefox/Thunderbird JS GC Invalid Pointer
CVE-2026-118026 Published on October 27, 2026

Invalid pointer in the JavaScript: GC component
Invalid pointer in the JavaScript: GC component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

NVD

Vulnerability Analysis

CVE-2026-118026 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 very high.

Exploitation:
NONE
Automatable:
NO
Technical Impact:
TOTAL
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
REQUIRED
Scope:
UNCHANGED
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-2026-118026 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2026-118026

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Mozilla Firefox
Mozilla Thunderbird

Affected Versions

Mozilla Firefox: Mozilla Thunderbird: