CVE-2026-109709

Summary

This vulnerability allows attackers to disclose sensitive information and escalate privileges within Firefox's process sandboxing component, potentially leading to full system compromise. The flaw enables unauthorized access to internal processes and data that should be isolated.

Exploitability

Exploitation requires a user interaction such as visiting a malicious website or opening a crafted email attachment, with no additional preconditions needed for successful exploitation.

Blast radius

If exploited, this vulnerability could affect millions of Firefox users who browse the web or use Thunderbird email client, potentially leading to widespread data breaches and privilege escalation across affected systems.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Upgrade to Firefox 158 or Thunderbird 158 immediately, as these versions contain the necessary fixes for this information disclosure and privilege escalation vulnerability.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.