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Mozilla Firefox and Firefox ESR Invalid Pointer Vulnerability in WebAssembly Component

Vulnerability

A vulnerability has been identified in the JavaScript WebAssembly component of Mozilla Firefox. This issue involves an invalid pointer, which can potentially lead to memory corruption. The vulnerability affects Firefox versions prior to 150 and Firefox ESR versions prior to 140.10. It was reported by a group of researchers using Claude from Anthropic.

Impact

Exploitation of this vulnerability could lead to memory corruption, with the potential to execute arbitrary code.

Remediation

Users can upgrade to Firefox 150 or Firefox ESR 140.10 to address this vulnerability.

Added: Apr 21, 2026, 2:12 PM
Updated: Apr 21, 2026, 2:12 PM

Vulnerability Rating

Custom Algorithm
spread
8.4
impact
0.6
exploitability
4.4
remediation
7.7
relevance
6.4
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.