mozilla firefox CVE-2026-118019 vulnerability in Mozilla Products
Published on October 27, 2026

Race condition, use-after-free in the DOM: File component

product logo product logo
Race condition, use-after-free in the DOM: File component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

NVD

Vulnerability Analysis

CVE-2026-118019 can be exploited 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.

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 Race Condition Vulnerability?

The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

CVE-2026-118019 has been classified to as a Race Condition vulnerability or weakness.


Products Associated with CVE-2026-118019

stack.watch emails you whenever new vulnerabilities are published in Mozilla Firefox or Mozilla Thunderbird. Just hit a watch button to start following.

Mozilla Firefox
 
Mozilla Thunderbird
 

Affected Versions

Mozilla Firefox: Mozilla Thunderbird: